Complex sentence: Ansaldo STS S.p.A. is a multinational technology company which produces signalling and automation systems for use by rail and rapid transit operators for the mass transit transportation industries, also acting as lead contractor and turnkey provider on new rail developments.
Split into simpler sentences: Ansaldo STS S.p.A. is a multinational technology company which produces signalling and automation systems for use by rail and rapid transit operators. The firm also acts as lead contractor and turnkey provider on new rail developments.