Complex sentence: It operated on a loop, or "belt", around downtown and the National Mall and for that reason, and because of its long name, it was often called the Belt Railway, which is what it changed its name to in 1893.
Split into simpler sentences: It operated on a loop, or "belt", around downtown and the National Mall. For that reason, and because of its long name, it was often called the Belt Railway, which is what it changed its name to in 1893.