Complex sentence: The shell was 1384 mm (4.5 ft) long and weighed 365 kg (805 lb); it was fired from a special artillery piece, nicknamed "Atomic Annie", built by the Artillery Test Unit of Fort Sill, Oklahoma.
Split into simpler sentences: The shell was 1384 mm (4.5 ft) long and weighed 365 kg (805 lb). It was fired from a special artillery piece, nicknamed the "Atomic Annie", built by the "Artillery Test Unit" of Fort Sill, Oklahoma.