Complex sentence: The camps at Bovington and Lulworth were originally established in 1899 as an infantry training area and ranges becoming, in 1916, the training camp for the Heavy Branch of the Machine Gun Corps which relocated from Norfolk.
Split into simpler sentences: The camps at Bovington and Lulworth were originally established in 1899 as an infantry training area and ranges. In 1916, they became training camps for the Heavy Branch of the Machine Gun Corps which relocated from Norfolk.