Complex sentence: After the destruction of the Pemalites at the hands of the Howlers, Erek, along with the rest of the Chee, escaped to Earth, and has lived there for thousands of years, using incredibly advanced holographic technology to pass as human.
Split into simpler sentences: After the destruction of the Pemalites at the hands of the Howlers, Erek, along with the rest of the Chee, escaped to Earth. They have lived on the planet for thousands of years, using incredibly advanced holographic technology to pass as human.