Conversation so far:
What year did he marry the first time?
1933.
Who did he marry?
Mandl.
Where did they meet?
CANNOTANSWER.
Where were they married?
CANNOTANSWER.
What happened during their marriage?
Lamarr's marriage to Mandl eventually became unbearable.
Why?
extremely controlling husband.

Question: What did he do to control her?
Self-contained rewrite: What did Hedy Lamarr do to control Mandl?