Complex sentence: One of his last stage performances was as Elisha Whitney in Cole Porter's "Anything Goes" at the Theatre Royal Drury Lane, but was too unwell to make the transfer from the National Theatre to the West End.
Split into simpler sentences: One of his last stage performances was as Elisha Whitney in a Cole Porter revue. He was to have been in the musical "Anything Goes" at the Theatre Royal Drury Lane, but was too unwell to make the transfer from the National Theatre to the West End.