Complex sentence: After Martin slips in the shower, Niles has decided that Martin cannot live by himself, but he cannot live with Niles, either, as he does not get along with Niles' wife Maris.
Split into simpler sentences: After Martin slips in the shower, Niles decides that Martin cannot live by himself. He cannot live with Niles either, as he does not get along with Niles' wife Maris.