Complex sentence: In 1464, Mehmed II commissioned 42 of these monster cannon to guard the Dardanelles each weighed 18.29 tonnes with a 762 mm (30 in) bore.
Split into simpler sentences: In 1464, Mehmed II commissioned 42 of these monster cannon to guard the Dardanelles. Each weighed 18.29 tonnes with a 762 mm (30 in) bore.