Complex sentence: Upon arriving in Khartoum, Bok was aided by fellow Dinka tribesman and members of the Fur people and his trip to the United States was paid for by members of the Lutheran church.
Split into simpler sentences: Upon arriving in Khartoum, Bok was aided by fellow Dinka tribesman and members of the Fur people. Bok's trip to the United States was paid for by members of the Lutheran church.