Complex sentence: His plan is to disturb the Celestials so that they would come to Earth and eradicate all life, leaving only his perfection to rebuild the planet, but Sinister is defeated and forced out from San Francisco.
Split into simpler sentences: His plan is to disturb the Celestials so that they would come to Earth and eradicate all life, leaving only his perfection to rebuild the planet. However, Sinister is defeated and forced out from San Francisco.