Complex sentence: The Pan-American Highway unofficially has four terminals entering into Mexico, with the Inter-American Highway beginning at the border crossing between Laredo, Texas, and Nuevo Laredo, Tamaulipas.
Split into simpler sentences: The Pan-American Highway unofficially has four terminals entering into Mexico. It is moore generally known as the Inter-American Highway in that country and officially begins at the border crossing between Laredo, Texas, and Nuevo Laredo, Tamaulipas.