Complex sentence: He was chorus master to the Belfast Philharmonic Choir (1991--97), the London Philharmonic Choir (1992--94), and is currently the musical director of the English Baroque Choir.
Split into simpler sentences: He was chorus master to the Belfast Philharmonic Choir (1991--97) and the London Philharmonic Choir (1992--94). He is currently the musical director of the English Baroque Choir.