Complex sentence: Hayate didn't remember that he lent a "King's Jewel" to Ikusa until in chapter 437, having an encounter with Eight, Hayate finally meets Ikusa (cross-dressing) at a beach who calls himself "lifesaver".
Split into simpler sentences: Hayate didn't remember that he lent a "King's Jewel" to Ikusa until in chapter 437. Having an encounter with Eight, Hayate finally meets Ikusa (cross-dressing) at a beach who calls himself "lifesaver".