Complex sentence: Van Waeyenberge was Director of De Persgroep Advertising from 2007 till 2011, responsible for the advertising revenues of the written press and various digital titles of De Persgroep.
Split into simpler sentences: Van Waeyenberge was Director of De Persgroep Advertising from 2007 till 2011. He was responsible for all the advertising revenues of the written press and various digital titles of De Persgroep.