Complex sentence: After the lifting of sanctions against Libya in 2004, the United States has gradually increased its importation of Libyan oil; the U.S. imported an average of of total Libyan oil exports in 2006, up from in 2005.
Split into simpler sentences: After the lifting of sanctions against Libya in 2004, the United States has gradually increased its importation of Libyan oil. The US imported an average of of total Libyan oil exports in 2006, up from in 2005.