Complex sentence: Kuching was known as Sarawak first, then the word "Proper" was added to Sarawak, thus Sarawak Proper, so as to distinguish it from the larger Sarawak which, in 1841, consisted of only the area between Tanjung Datu, and the Samarahan River.
Split into simpler sentences: Kuching was known as Sarawak first, then the word "Proper" was added to Sarawak, thus Sarawak Proper, so as to distinguish it from the larger Sarawak. In 1841, it consisted of only the area between Tanjung Datu, and the Samarahan River.