Complex sentence: The plans for a tunnel to Bjorøy was first launched by Engineer Jack Jahnsen in 1980, based on the then under construction Vardø Tunnel, which became the first subsea tunnel in Norway when it opened in 1982.
Split into simpler sentences: The plans for a tunnel to Bjorøy were first launched by the engineer Jack Jahnsen in 1980. These were based on the then under construction Vardø Tunnel, which became the first subsea tunnel in Norway when it opened in 1982.