Original sentence: FC Köln is a German football club in Cologne,  North Rhine-Westphalia formed in 1948 out of the merger of Kölner Ballspiel-Club 1901 and SpVgg Sülz 07
Edited sentence: FC Köln is a German football club in Cologne,  North Rhine-Westphalia.Formed in 1948 out of the merger of Kölner Ballspiel-Club 1901 and SpVgg Sülz 07, they are today the dominant club in the city and one of the most popular sides in the country