Complex sentence: The Chuck Berry show overran mainly through late start and poor organization, for example before Billy Preston's set very considerable time and effort were spent trying to get a piano through the crowd (it was an all standing event) onto the stage.
Split into simpler sentences: The Chuck Berry show overran mainly through late start and poor organization. For example, before Billy Preston's set very considerable time and effort were spent trying to get a piano through the crowd (it was an all standing event) onto the stage.