Complex sentence: The Company was previously known as Bodlets (the junior section to BODS) and changed it's name to Zenith Youth Theatre Company in 2003 with its first production under the new name being Some Like It Hot.
Split into simpler sentences: The Company was previously known as Bodlets (the junior section to Bath Operatic and Dramatic Society) and changed it's name to Zenith Youth Theatre Company in 2003. The first production under the new name being Some Like It Hot.