Complex sentence: This was facilitated by the large number of public theatres already present in the city which originally served for the production of plays and were built by noble families such as the Grimani, Tron, and Vendramin.
Split into simpler sentences: This was facilitated by the large number of public theatres already present in the city which originally served for the production of plays. They were built by noble families such as the Grimani, Tron, and Vendramin.