Complex sentence: It was also performed by the Royal Opera, London as concert performances in 1995 (its UK premiere in this version) and again in 1997; it was also given by New York Grand Opera in 1999, the latter being its first New York performance.
Split into simpler sentences: It was also performed by the Royal Opera, London as concert performances in 1995 (its UK premiere in this version) and again in 1997. That same year it was given by New York Grand Opera, this being its first New York performance.