Complex sentence: But when they ask the other band members if they were singing harmony and are told "no", Roscoe sees Loretta's ghostly figure in the spotlight, and he comments that The Zetta Bytes have a guardian angel.
Split into simpler sentences: But when they ask the other band members if they were singing harmony, they say "no". A few moments later, Roscoe sees Loretta's ghostly figure in the spotlight, and he comments that The Zetta Bytes have a guardian angel.