Complex sentence: They tied in the quarter-finals against Atlante 1--1 and 1--1 (2--2), though Atlante progressed to semi-finals because they finished the regular season higher than Tigres, in third place.
Split into simpler sentences: They tied in quarter-finals against Atlante by 1--1 and 1--1 (2--2). Atlante went to semi-finals because they finished the regular season in third place.