Complex sentence: When Bay and Emmett begin dating, Melody disapproves, not believing deaf/hearing relationships can work due to culture differences, and strongly believes that Bay (despite being her best friend Regina's biological daughter) is a bad influence on Emmett.
Split into simpler sentences: When Bay and Emmett begin dating, Melody disapproves, not believing deaf/hearing relationships can work due to culture differences. She strongly believes that Bay (despite being her best friend Regina's biological daughter) is a bad influence on Emmett.