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Could anyone please tell me if these sentences sound natural? Thank you.

1) James Watt made the steam engine more efficient and continued developing it for several years.

2) Baird's television system was replaced by technically advanced broadcasting developed by Marconi. (Can I use the word BROADCASTING here?)

3) Tourists also like picking small brick-red stones from Loch Ness and keeping them as souvenirs. (Is PICK the right word??)

4) The Saltire or the Scottish national flag consists of a white cross on a blue background. (Should I add commas?)

5) Their opening hours are similar to those of ordinary shops. During the high season they are available also on Sundays.
Comments  
Hi Eff,

Yes, they are (almost) all grammatically correct, and sound pretty natural to this native English speaker. . However, if they were my sentences, I'd make a few minor changes, as follows:

1) James Watt made the steam engine more efficient and continued developing it for several years.

That is fine as it is, although I'd probably put a comma after efficient.

2) Baird's television system was replaced by a technically more advanced broadcasting system developed by Marconi. (Can I use the word BROADCASTING here?)

3) Tourists also like picking up small brick-red stones from Loch Ness and keeping them as souvenirs. (Is PICK the right word??)

Pick is a synonym of choose, but picking up is better here, because it describes the physical act of lifting the stones from the shores of the loch.

4) The Saltire, or the Scottish national flag, consists of a white cross on a blue background. (Should I add commas?)

Yes, I'd add commas, as shown above.

5) Their opening hours are similar to those of ordinary shops. During the high season they are available also on Sundays.

Instead of available also, I'd say also open or open also.

Excellent English, nonetheless....
Thanks a million, Yizhivika!