Rewrite the sentences in the past simple passive form. Use the agent where necessary. 1 The Phoenicians first used sails around 2,000 BC. 2 They introduced electric cars in 1896. 3 The Egyptians created the first organised navy in 2,300 BC. 4 The Sumerians developed oar-powered ships in 3,500 BC. 5 Cornelius van Drebbel built the first submarine in 1620.