Complex sentence: In September 1973, Smith scored the only goal of the game as United defeated Dundee in the Dundee derby; he celebrated by kissing his boot, a gesture which he was later embarrassed by.
Split into simpler sentences: In September 1973, Smith scored the only goal of the game as United defeated Dundee in the Dundee derby. He celebrated by kissing his boot, a gesture which he was later embarrassed by.