Complex sentence: The majority of Libyan refugees are Arabs and Berbers, though many of other ethnicities temporarily living in Libya, originated from sub-Saharan Africa, were also among the first refugee waves to exit the country.
Split into simpler sentences: The majority of Libyan refugees are Arabs and Berbers, though many of the other ethnicities temporarily living in Libya originated from sub-Saharan Africa. These groups were also among the first refugee waves to exit the country.