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Hi

Rizzo doesn't get as much respect and admiration as he deserves given that his biggest fights were before the UFC and MMA took off.

Does it mean "Because his biggest fights were before the UFC and MMA took off,he doesn't get as much respect and admiration as he deserves"?
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"Given that ..." is a phrase that means something like "considering that ..." or "when you consider that ...".
I'll use a better example.
"She plays the violin well, GIVEN THAT she just started learning two years ago".
This means that she just started learning the violin two years ago. This is a FACT, or a "GIVEN", which we need to CONSIDER or TAKE INTO ACCOUNT when we comment on how well she plays. And, CONSIDERING this GIVEN FACT, she plays well.
She might not play as well as someone the same age who has been learning for six years, but GIVEN THAT she has only been learning for TWO years, she plays well.
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Hi

So is using "because" by me at the beginning of the sentence is wrong? Did I change the meaning of the original sentence?

How about: His biggest fights were before the UFC and MMA took off and that's why Rizzo doesn't get as much respect and admiration as he deserves.

Thanks
No, I wouldn't exactly say that.
The writer is not simply trying to explain WHY Rizzo doesn't get the respect and admiration he deserves.
The writer is trying to JUSTIFY his OPINION that Rizzo deserves more respect and admiration than he gets.
Another way of expressing his claim is:

"I believe that Rizzo deserves more respect and admiration than he gets. If you disagree with me, BEAR IN MIND (or CONSIDER) the FACT (the GIVEN) that his biggest fights were before the UFC and MMA took off. If you TAKE this FACT INTO ACCOUNT when you think about how much respect and admiration Rizzo deserves, you may see that he deserves more respect and admiration, and you may agree with me."
I understand now. Thank you Emotion: smile
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