Complex sentence: The African oil palm "Elaeis guineensis" (the species name "guineensis" referring to its country of origin) is the principal source of palm oil it is native to west and southwest Africa, occurring between Angola and Gambia.
Split into simpler sentences: The African oil palm "Elaeis guineensis" (the species name "guineensis" referring to its country of origin) is the principal source of palm oil. It is native to west and southwest Africa, occurring between Angola and Gambia.