Indentify the type of sentence. since the expresswsay was built, very few tourists have visited our town.

Since the expressway was built, very few tourists have visited our town.

The above sentence is a complex sentence.

A complex sentence is made up of one independent clause and one or more dependent clauses.

Independent clause = very few tourists have visited our town.

dependent clause = since the expressway was built

Dependent clause always start with a subordinating conjunction. "Since" is a subordinating conjunction. A dependent clause also cannot stand alone or on its own. Its primary purpose is to give additional information on the independent clause.