Complex sentence: Subsequent excavations indicated that the trash mound was likely created by more than typical household waste; numerous layers of the mound are composed of refuse from large-scale feasts that included the ritualistic smashing of pottery.
Split into simpler sentences: Subsequent excavations indicated that the trash mound was likely created by more than typical household waste. Archeologists theorize that numerous layers of the mound are composed of refuse from large-scale feasts that included the ritualistic smashing of pottery.