Conversation so far:
Who was Lamarr's first marriage?
Lamarr married Mandl, an Austrian military arms merchant and munitions manufacturer.
What happened during this marriage?
In her autobiography Ecstasy and Me, she described Mandl as an extremely controlling husband.
How long were they married?
Lamarr's marriage to Mandl eventually became unbearable, and she decided to separate herself from both him and her country.

Question: What happened after this?
Self-contained rewrite: What happened after Hedy Lamarr separated from Mandl and her country?