Complex sentence: Pantitlán station is the most important cross between Mexico City metro lines, it is the terminal for lines 1,5,9 and A, and has the highest user-traffic of the whole metro system.
Split into simpler sentences: Pantitlán station is the most important cross between Mexico city metro lines. Is the terminal for 1,5,9 and A lines, and has the highest user-traffic in all metro system.