Conversation so far:
How many times was Ethel Merman married?
Merman was married and divorced four times.
Who did Ethel Merman marry first?
Her first marriage, in 1940, was to theatrical agent William Smith.
When did Ethel Merman divorce William Smith?
They were divorced in 1941.

Question: When did she next marry?
Self-contained rewrite: When did Ethel Merman after William Smith next marry?