Complex sentence: Until the 1940's the city was reachable only by the lake or through the mountains, with the road to Riva del Garda being built only 1932, but today Limone is one of the most renowned tourist resorts in the area.
Split into simpler sentences: Until the 1940s the city was reachable only by the lake or through the mountains, a road connecting to Riva del Garda being built only 1932. Today Limone is one of the most renowned touristic resorts in the area.