Complex sentence: Additions to the end musical number, including visual gags such as Bob appearing in uniform, were added after the animatics, because the crew felt that watching the character singing would not be interesting enough and they had to include these gags to make it work.
Split into simpler sentences: Additions to the end musical number, including visual gags such as Bob appearing in uniform, were added after the animatics. The crew felt that watching the character singing would not be interesting enough and they had to include these gags to make it work.