Complex sentence: In 1972, he appeared in the musical "Trelawney", with which the Bristol Old Vic reopened after its refurbishment, and which, having proved a great success, transferred to London, first to Sadler's Wells and later to The Savoy.
Split into simpler sentences: In 1972, he appeared in the musical "Trelawney", with which the Bristol Old Vic reopened after its refurbishment. It proved a great success, transferring to London, first to Sadler's Wells and later to The Savoy.