Simplify the following text for a Grade 8 native English-speaking person.
Original: In 1891 Charles Norman Fay , a Chicago businessman , invited Theodore Thomas to establish an orchestra in Chicago . Conducted by Theodore Thomas under the name `` Chicago Orchestra '' , the Orchestra played its first concert on October 16 , 1891 at the Auditorium Theatre .
Simplified: The Chicago Symphony Orchestra was started in 1891 .