Q: Studying is hard work many students find they study better when they take regular breaks.

A: Studying is hard work, many students find they study better when they take regular breaks.

Is this correct?

5 answers

No. You can't join two independent clauses with a comma.
Same error as in the next one.

Sra
Studying is hard work; many students find they study better when they take regular breaks.

Is this right?
Yes, although you might want a comma between "better" and "when."
No comma between better and when.