Complex sentence: By the end of the 18th century, when they first came into sustained contact with outsiders, there were estimated 7,000 Andamanese, divided into five major groups, with distinct cultures, separate domains and mutually unintelligible languages.
Split into simpler sentences: By the end of the 18th century, when they first came into sustained contact with outsiders, there were an estimated 7,000 Andamanese divided into five major groups. Each group had distinct cultures, separate domains and mutually unintelligible languages.