Complex sentence: The first six cars were built by Schweizerische Industrie Gesellschaft (Swiss Industrial Company, SIG) and the rest by Hawker Siddeley Canada Limited in Thunder Bay, with a propulsion system by Brush of England and bogies by MAN of Germany.
Split into simpler sentences: The first six cars were built by Schweizerische Industrie Gesellschaft (Swiss Industrial Company, SIG). The rest by Hawker Siddeley Canada Limited in Thunder Bay, with a propulsion system by Brush of England and bogies by MAN of Germany.