Complex sentence: BTW, I'd be glad if someone can check if the addition was done correctly, because I don't have much experience in writing and expanding articles in English, and I'm not sure the references to scientific articles was done correctly.
Split into simpler sentences: BTW, I'd be glad if someone can check if the addition was done correctly, because I don't have much experience in writing and expanding articles in English. Specifically, I'm not sure the references to scientific articles were done correctly.