Complex sentence: He escaped his foster family to reunite the other Serpentor clones along with Dr. Mindbender, and served in the Coil under Serpentor, until being taken into custody after their defeat.
Split into simpler sentences: He escaped his foster family to reunite the other Serpentor clones along with Dr. Mindbender. He served in the Coil under Serpentor and was taken into custody after their defeat.