Complex sentence: When the city finally fell to Nitta, Hōjō Takatoki, the shogunal regent, fled to Tōshō temple, where he and his entire family committed suicide; this ended Hōjō power and paved the way for a new military regime.
Split into simpler sentences: When the city finally fell to Nitta, Hōjō Takatoki, the shogunal regent, fled to Tōshō temple, where he and his entire family committed suicide. This ended Hōjō power and paved the way for a new military regime.