Complex sentence: Menzies' wife, Griffin, who had joined the company as principal soprano for its tour of South Africa in 1933, accompanied her husband on the 1949-51 tour, but she did not perform.
Split into simpler sentences: Menzies' wife, Elsie Griffin, had also been a member of the company, joining as principal soprano for its tour of South Africa in 1933. Although she accompanied her husband on the 1949-51 tour, she did not perform.