Complex sentence: Sky Witness played a major part in the political events of the Maya region, he became the overlord of the city of Caracol, to the south of Naranjo, which had previously been a vassal of Tikal.
Split into simpler sentences: Sky Witness played a major part in the political events of the Maya region. He became the overlord of the city of Caracol, to the south of Naranjo, which had previously been a vassal of Tikal.