Complex sentence: Some researchers have argued that vocal fry is a register in American English used by girls and women to give their voice more credibility, while others argue that the result is that they sound less confident, undermining the effectiveness of their communication.
Split into simpler sentences: Some researchers have argued that vocal fry is a register in American English used by females to give their voice more credibility. Others argue that the result is that they sound less confident, undermining the effectiveness of their communication.