Complex sentence: It was one of the first true light machine guns produced in quantity and sold to over 34 different countries worldwide in 12 different calibres, seeing extensive combat use in various conflicts around the globe for over 100 years.
Split into simpler sentences: It was one of the first true light machine guns produced in quantity and sold to over 34 different countries worldwide in 12 different calibres. It saw extensive combat use in conflicts around the globe for over 100 years.