Complex sentence: In 1985 he became a tenured researcher at the NFWO and in 2000 professor at the VUB, where since 1995 he directs the VUB's Center Leo Apostel for interdisciplinary studies.
Split into simpler sentences: In 1985 he became a tenured researcher at the NFWO and in 2000 professor at the VUB. Since 1995 he is directing the VUB's Center Leo Apostel for interdisciplinary studies.