Complex sentence: Van Gaal also led AZ to a runners-up finish in the 2006--07 KNVB Cup and lost a 2007--08 UEFA Champions League qualification play-off to Ajax 4--2 on aggregate.
Split into simpler sentences: Van Gaal also led AZ to a runners-up finish in the 2007 KNVB Cup. AZ failed to reach the UEFA Champions League after losing to Ajax 4--2 on aggregate.