Complex sentence: Fort Victoria was a single tier battery with defensible barracks west of Yarmouth, Isle of Wight, England, built in the 1850s, later used as a submarine mining centre and training area for military purposes.
Split into simpler sentences: Fort Victoria was a single tier battery with defensible barracks west of Yarmouth, Isle of Wight, England. It was built in the 1850s, later used as a submarine mining centre and training area for military purposes.