Complex sentence: The Type 80 was developed in the 1970s and introduced into service in 1980, it was intended to give service personnel such as tank crews an individual weapon compact enough to be carried as standard equipment.
Split into simpler sentences: The Type 80 was developed in the 1970s and introduced into service in 1980. It was intended to give service personnel such as tank crews an individual weapon compact enough to be carried as standard equipment.