Complex sentence: Leo discovers that Spyroach is targeting Raph and chases him until it gets caught in the wet cement, but Spyroach molts its skin and emerges in a second form which it can now fly.
Split into simpler sentences: Leo discovers that Spyroach is targeting Raph and chased him until he got caught in the wet cement. It is then discovered that Spyroach had molted its skin and emerges in a second form where it can now fly.