Complex sentence: I Tre Mercanti was started in 2006 by Roberto Caruti; a retail manager for Gucci, Emanuele Dal Carlo; owner of an advertising agency on the Venetian mainland and Andrea Della Valentina; general manager of glass company in Murano.
Split into simpler sentences: I Tre Mercanti was started in 2006 by Roberto Caruti, Emanuele Dal Carlo and Andrea Della Valentinaan. Before starting I Tre Mercanti, Caruti worked for Gucci, Carlo; served as an executive with an Italian company on the Venetian mainland and Valentinaan managed a glass company in Murano.