Complex sentence: When Ikkaku Madarame protects him from an arrancar, Keigo is coerced into letting him and his partner, Yumichika Ayasegawa, stay at his house, which his sister, the sultry Mizuho, happily agrees to, if only because she loves shaved heads.
Split into simpler sentences: When Ikkaku Madarame protects him from an arrancar, Keigo is coerced into letting Ikkaki and his partner, Yumichika Ayasegawa, stay at his house. Keigo's sister, the sultry Mizuho, happily welcomes them, if only because she loves shaved heads.