Original sentence: This list of Test cricket triple centuries shows all instances where a batsman has scored 300 runs or more in a single innings in Test cricket, a feat achieved on 23 occasions by 20 different batsmen from six of the ten Test-cricket playing nations
Edited sentence: A triple century occurs when a batsman scores 300 runs or more in a single innings.Triple centuries in Test cricket have been achieved on 23 occasions by 20 different batsmen from six of the ten Test-cricket playing nations