Complex sentence: In 1935, FK Železničar Beograd built a new stadium; in the opening game they crushed FK Gradjanski, from Zemun, 12--0, in a memorable game for the fans.
Split into simpler sentences: In 1935, FK Železničar Beograd built a new stadium. In the opening match they crushed FK Građanski, from Zemun, 12--0, in a memorable match for the fans.