Complex sentence: Seiuchin's mom throws a fish into Clioneman's body allowing Seiuchin to escape he expands his body into his aqua lens and attempts to burn Seiuchin alive.
Split into simpler sentences: Seiuchin's mom throws a fish into Clioneman's body allowing Seiuchin to escape. Clione expands his body into his aqua lens and attempts to burn Seiuchin alive.