Complex sentence: The original Fitz, in the meantime, went on to become Father Kreiner, a Faction agent who hunted down many Time Lords before he was drawn into a bottle universe by the mysterious Gallifreyan I.M. Foreman.
Split into simpler sentences: The original Fitz, in the meantime, went on to become Father Kreiner, a Remote agent who hunted down many Time Lords. He was drawn into a bottle universe by the mysterious Gallifreyan I.M. Foreman.