Complex sentence: Until 1991, The AOBO (and its Melbourne cousin Orchestra Victoria) were formerly known as The Elizabethan Sydney Orchestra and The Elizabethan Melbourne Orchestra respectively, initially established by the Australian Elizabethan Theatre Trust in the mid 1960's.
Split into simpler sentences: Until 1991, The AOBO (and its Melbourne cousin Orchestra Victoria) were formerly known as The Elizabethan Sydney Orchestra and The Elizabethan Melbourne Orchestra respectively. It was initially established by the Australian Elizabethan Theatre Trust in the mid 1960's.