come a long way, circuit

[user_gary]

Dalip is illiterate and worked for many years as a labourer in a small hamlet and later in Shimla, after which he was picked by the neighbouring Punjab Police chief and recruited as a constable,' said Sai Singh."
Shimla, May 19 - From working as a labourer in a tiny Himalayan village to the rings of a professional wrestling circuit that is watched by millions worldwide, Dalip Singh Rana aka Singh has come a long way.
Singh now fights for the World Wrestling Entertainment (WWE) in the United States under the ring name 'The Great Khali'. Standing at 7 feet 3 inches and weighing 420 pounds, Singh is one of the tallest wrestlers in the popular WWE circuit.

Please explain the highlighted ones.

[Anglika]

professional wrestling circuit - The series of wrestling contests.

Singh has come a long way. The man concerned started out as a peasant in a remote village and through his abilities as a wrestler is now well-known. There is a great distance (metaphorically) between working in a remote village and starring on national television.