Complex sentence: In conjunction with the'Hunt building' the school also opened a new theatre, which was opened by Lord Briggs, since the schools expansion in 2009, this has been turned into the school refectory.
Split into simpler sentences: In conjunction with the'Hunt building' the school also opened a new theatre, which was opened by Lord Briggs. Since the school's expansion in 2009, this has been turned into the school refectory.