Complex sentence: Because of the differences in gender and age, the drummers and dancers do not typically communicate with each other verbally during rehearsals, instead the director of the group acts as a middleman so they do not need to interact.
Split into simpler sentences: Because of the differences in gender and age, the drummers and dancers do not typically communicate with each other verbally during rehearsals. Instead, the director of the group acts as a middleman so they do not need to interact.