Complex sentence: The system consists primarily of paved, two-lane roads, though some segments are freeways, including a segment of (the Emmett F. Lowry Expressway between Interstate 45 and Texas City, Texas).
Split into simpler sentences: The system consists primarily of paved, two-lane roads. Some segments are even expressways, including a segment of (the Emmett F. Lowry Expressway between Interstate 45 and Texas City, Texas).