Complex sentence: Bangka-Belitung Islands is a province of Indonesia, which includes two main islands, Bangka and Belitung, and several smaller ones that lie from the east of Sumatra to the northeast of South Sumatra province.
Split into simpler sentences: Bangka-Belitung Islands is a province of Indonesia. It includes two islands, Bangka and Belitung, and several smaller ones, which lie east of Sumatra, northeast of South Sumatra province.