Complex sentence: Van Steen was chief conductor of the Orchester Musikkollegium Winterthur from 2002 to 2008 and between 2008 and 2013 he was Generalmusikdirektor of the Dortmunder Philharmoniker (Dortmund Philharmonic Orchestra).
Split into simpler sentences: Van Steen was chief conductor of the Orchester Musikkollegium Winterthur from 2002 to 2008. Between 2008 and 2013, he was Generalmusikdirektor of the Dortmunder Philharmoniker (Dortmund Philharmonic Orchestra).