Complex sentence: As the months progressed, they began to think about what had happened to the characters of "Degrassi High" to develop a school-reunion theme; however, they decided that a series would not work effectively if based around adults instead of children.
Split into simpler sentences: As the months progressed, they began to think about what had happened to the characters of "Degrassi High" to develop a school-reunion theme. However, they decided that a series would not work effectively if based around adults instead of children.