Complex sentence: In the late 1880s, tensions left unresolved from this conflict would lead to the Round Valley War when, in defiance of federal authority, settlers once again began to take over areas of the reservation, ignoring federal policies and settling on Yuki lands.
Split into simpler sentences: In the late 1880s, tensions left unresolved from this conflict would lead to the Round Valley War. Once again, in defiance of federal authority, settlers began to take over areas of the reservation, ignoring federal policies and settling on Yuki lands.