Complex sentence: He began his invasion of Ise province, largely under the control of the Kitabatake clan, in 1567 and by late 1570 he had forced Kitabatake Tomonori to adopt his son Nobukatsu as heir, effectively securing Oda dominion over the province.
Split into simpler sentences: He began his invasion of Ise province, then largely under the control of the Kitabatake clan, in 1567. By late 1570 he had forced Kitabatake Tomonori to adopt his son Nobukatsu as heir, effectively securing Oda dominion over the province.