Legion Condor was a group of soldiers from Germany who went to Spain a long time ago (in the 1930s). They were there to help another group of soldiers called the Nationalists, who were fighting against a group of other soldiers called the Republicans.
The Nationalists and the Republicans were fighting over who gets to control Spain, and Germany wanted to help the Nationalists because they were friends with them. So, they sent the Legion Condor to give them weapons, airplanes, and other things to help them fight.
The Legion Condor did a lot of fighting in Spain, and they helped the Nationalists win the war. But, some people didn't like what the Legion Condor was doing because they thought it was wrong to help one side of the war instead of trying to make peace.
Overall, the Legion Condor was a group of soldiers from Germany who went to Spain to help another group of soldiers win a war. But, not everyone liked what they did.