Direct Narration and Indirect Narration

Original Sentence: It was reported that John Doe had been taken to hospital after he was found unconcious in his room.

Step 1: It was reported that John Doe had been taken to hospital after he was found unconcious in his room.

Step 2: It was reported (by Peter) that John Doe had been taken to hospital (by Peter) after he was found unconcious in his room (by Peter).

Step 3: Peter reported that he had taken John Doe to hospital after he found him unconcious in his room.

Step 4: Peter reported, ''he took John Doe to hospital after he found him unconcious in his room.''

Reversing the order of steps, we again get the original sentence. Right?

Questions:

1: Why isn't there any change in the tense of the clause ''he found him unconcious in his room'' when Direct Speech of Step 4 is changed into Indirect Speech of Step 3?

2: Can't we write this statement ''Peter reported that he had taken John Doe to hospital after he found him unconcious in his room'' as ''Peter reported that he took John Doe to hospital after he found him unconcious in his room''? If we cannot do so then what is the reason for this? What harm will it cause? What will be the difference in meaning if took is used in place of had taken?

Jackson6612 wrote:

Original Sentence: It was reported that John Doe had been taken to hospital after he was found unconcious in his room. Step 1: It was reported that John Doe had been taken to hospital after he was found unconcious in his room. Step 2 (Passive Voice): It was reported (by Peter) that John Doe had been taken to hospital (by Peter) after he was found unconcious in his room (by Peter). Step 3 (Active Voice): Peter reported that he had taken John Doe to hospital after he found him unconcious in his room. Step 4 (Direct Speech): Peter reported, ''he took John Doe to hospital after he found him unconcious in his room.'' Reversing the order of steps, we again get the original sentence. Right? Questions: 1: Why isn't there any change in the tense of the clause ''he found him unconcious in his room'' when Direct Speech of Step 4 is changed into Indirect Speech of Step 3? 2: Can't we write this statement ''Peter reported that he had taken John Doe to hospital after he found him unconcious in his room'' as ''Peter reported that he took John Doe to hospital after he found him unconcious in his room''? If we cannot do so then what is the reason for this? What harm will it cause? What will be the difference in meaning if took is used in place of had taken?

Please reply to above post. Thank you.

Well, to tell the truth past perfect isn't used much in English as much as simple past and past perfect can't be changed into past.I mean past perfect is the end of the road.    

As for your question, I really don't think there will be something wrong if you change it into past perfect.The only thing will be that you will draw our attention to the time order while reading the sentence (Hm be careful!He first fainted then was taken to hospital).But in your sentence be careful about which action took place first.I think it should be he took him hospital after he had found him ill/unconscious.