Conversation so far:
how did Art Donovan's career start?
In each of his first three seasons, Donovan played for a team which went out of business.
which was the first team?
He started out with the first Baltimore Colts, who folded after his rookie season in 1950.
who did he play for next?
followed by the New York Yanks in 1951.
and which was the last team?
the Dallas Texans, in 1952.

Question: what did he do after Dallas Texans?
Self-contained rewrite: what did Art Donovan do after leaving the Dallas Texans?