Complex sentence: Valdez made his first appearance in the 2005--06 Bundesliga in a 2--0 away win against Mainz 05 in round 2 on 14 August, where he entered the field in the 68th minute.
Split into simpler sentences: Valdez made his first appearance in the 2005--06 Bundesliga in a 2--0 away win against 1. FSV Mainz 05 in round 2 on 14 August, where he entered the field in the 68th minute.