Complex sentence: As part of the negotiations, Switzerland offered to build a new high-speed rail link through the Alps for the main purpose of intermodal transport, which was accepted by a public vote on 27 September 1992.
Split into simpler sentences: As part of the negotiations, Switzerland offered to build a new high-speed rail link through the Alps for the main purpose of intermodal transport. Swiss voters approved the link by a public vote on 27 September 1992.