Complex sentence: However Green Lantern escaped and defeated Sinestro on Oa, who was placed in a green energy container which would orbit the Universe by the power of many Green Lanterns, but he escaped with a power ring hidden in his boot.
Split into simpler sentences: However Green Lantern escaped and defeated Sinestro on Oa, who was placed in a green energy container which would orbit the Universe by the power of many Green Lanterns. But he escaped with a power ring hidden in his boot.