Complex sentence: After that, he mysteriously "gets bored" and flees when the battle begins to turn against him, his whereabouts unknown (some say he may infact be a planeswalker and left Ravnica entirely).
Split into simpler sentences: After that, he mysteriously "gets bored" and flees when the battle begins to turn against him. His whereabouts are currently unknown (some say he may infact be a planeswalker and left Ravnica entirely).