Complex sentence: But when they ask the other band members if they were singing harmony and get "no" 's, they see Loretta's ghostly figure in the spotlight and Roscoe comments that the Zetabytes have a guardian angel.
Split into simpler sentences: But when they ask the other band members if they were singing harmony and get "no". Roscoe sees Loretta's ghostly figure in the spotlight and he comments that the Zetabytes have a guardian angel.