Complex sentence: Origen's cosmology is complicated and controverted, but he seems to have held to a hypothesis of the preexistence of souls, before the known world was created by God, God created a great number of spiritual intelligences.
Split into simpler sentences: Origen's cosmology is complicated and controverted, but he seems to have held to a hypothesis of the preexistence of souls. Before the known world was created by God, He created a great number of spiritual intelligences.