Complex sentence: C’N’C Costume National showed the SS2010 Collection in Piazza Duomo in front of 40.000 guests, rather than to a limitied number of "those who are active in the industry".
Split into simpler sentences: C’N’C Costume National showed the SS2010 Collection in Piazza Duomo in front of 40.000 guests. Fashion opened its runways to the general public and not only to "those who are active in the industry".