The revision of these two sentences that uses a relative clause is "The orchestra that was seated on stage played a difficult score".
Relative clauses are<u> clauses that start with a relative pronoun</u>. In this case, <u>the relative pronoun that has been used is "that" </u>and <u>the relative clause is "that was seated on stage"</u>. Furthermore, a relative clause is used to identify or define the noun that precedes it. In this case, <u>the noun identified by the clause is "orchestra"</u>. Therefore, the relative clause "that was seated on stage" is postmodifying the noun "orchestra".
School can be boring so I just make it fun talk to your friends and joke around with your teachers and you'll be fine x
