Complex sentence: He expresses fondness for older British Army weaponry such as the Sten and Sterling submachine guns, although he is more than capable of using modern weaponry such as the Heckler & Koch MP5.
Split into simpler sentences: He expresses fondness for older British Army weaponry such as the Sten and Sterling submachine guns. However he is more than capable of using modern weaponry such as the Heckler & Koch MP5.