Complex sentence: European settlement in and around Cape Town later spread into the valleys and the further it moved up the Eastern coast, the Europeans (predominantly Boers) encountered the Xhosa during the second half of the 18th century in the region of the Great Fish River.
Split into simpler sentences: European settlement in and around Cape Town later spread into the valleys. As the Europeans (predominantly Boers), moved up the Eastern coast during the second half of the 18th century, they encountered the Xhosa in the region of the Great Fish River.