Complex sentence: In 1994 they co-founded Seattle Baroque Orchestra, where Schenkman was artistic director from 1994 through 2004, and co-director from 2010 to 2013.
Split into simpler sentences: In 1994 they co-founded Seattle Baroque Orchestra. He served as its Artistic Director from 1994 through 2004, and again as co-director from 2010 to 2013.