Conversation so far:
What television shows did Buster Crabbe appear in?
Buster Crabbe starred in the syndicated television series, Captain Gallant of the Foreign Legion.
How long was the show Crabbe starred in on air?
1955 to 1957
What other shows did Crabbe feature in besides Captain Gallant of the Foreign Legion?
Buster Crabbe was frequently featured in archival footage in the children's television program, The Gabby Hayes Show.
What was the name of the children's television program that Buster Crabbe was featured in?
The Gabby Hayes Show
When was the TV show The Gabby Hayes Show on air?
It aired from December 11, 1950, to January 1, 1954.
What other interesting aspects can you tell me about the  Wikipedia article on Buster Crabbe?
Buster Crabbe's Hollywood career waned somewhat in the 1950s and 1960s.

Question: What happened in the 1950s?
Self-contained rewrite: What happened to Buster Crabbe in the 1950s?