Complex sentence: Originally opened on April 28,1940, the system currently comprises 15 routes, with 159 trolleybuses operating on of two-way overhead wires that carry riders on over 20 million trips per year, comprising about 20 percent of Metro's total daily ridership.
Split into simpler sentences: Originally opened on April 28,1940, the system currently comprises 15 routes, with 159 trolleybuses operating on over 70 miles of two-way overhead wires. The 15 trolleybus routes use of overhead wire and carry riders on over 20 million trips per year, comprising about 20 percent of Metro's total daily ridership.