Conversation so far:
What is the Borussia Mönchengladbach?
Borussia Mönchengladbach is a professional football club that plays in the Bundesliga, the top flight of German football
Where was the team Borussia Mönchengladbach located?
The Borussia Mönchengladbach professional football club is based in Mönchengladbach, North Rhine-Westphalia, Germany.
How long was Allan Simonsen on the Borussia Mönchengladbach team for?
Allan Simonsen was on the Borussia Mönchengladbach team from 1972-1979.
Did the team Borussia Mönchengladbach win many matches with Allan Simonsen?
Borussia Mönchengladbach won many matches, including the German Cup, Bundesliga championship, and games in the UEFA Cup and European Cup
What did Allan Simonsen do after moving to Barcelona?
In his first Barcelona season, Simonsen was the top goal scorer of the team with 10 goals in 32 games
Why did Allan Simonsen play so few games in Barcelona?

Question: How did he get onto the team to begin with?
Self-contained rewrite: How did Allan Simonsen get onto the Barcelona soccer team to begin with?