Final answer:
The sentence 'Ben was told that he was not allowed to attend the conference, yet I saw him sitting at the table with his teachers' is an example of a compound-complex sentence.
Step-by-step explanation:
The sentence 'Ben was told that he was not allowed to attend the conference, yet I saw him sitting at the table with his teachers' is an example of a compound-complex sentence.
A compound-complex sentence contains two or more main clauses (clauses that can stand alone as sentences) and one or more subordinate clauses (clauses that begin with a subordinating word).
In this sentence, 'Ben was told that he was not allowed to attend the conference' and 'I saw him sitting at the table with his teachers' are the two main clauses, and 'that he was not allowed to attend the conference' is the subordinate clause.