Complex sentence: During the Second World War when the Germans mined extensively outside Falsterbonäset at the Falsterborev (Falsterbo reef) in 1939, Sweden concluded that a canal was needed between Höllviken and Ljunghusen to allow safe passage of coastal traffic.
Split into simpler sentences: During the Second World War when the Germans mined extensively outside Falsterbonäset at the Falsterborev (Falsterbo reef). In 1939 Sweden concluded that a canal was needed between Höllviken and Ljunghusen to allow safe passage of coastal traffic.