Complex sentence: At first, the Nama began displacing the Herero, this led to bitter warfare between the two groups which lasted the greater part of the 19th century, but later both peoples entered into a period of cultural exchange.
Split into simpler sentences: At first, the Nama began displacing the Herero, leading to bitter warfare between the two groups which lasted the greater part of the 19th century. Later the two peoples entered into a period of cultural exchange.