Original sentence: It is a commercial implementation of the S programming language.Its full featured object-oriented programming capabilities and advanced analytical algorithms are slowly enabling it to become a fierce competitor to the SAS System.S-PLUS is a commercial advanced statistics package sold by Insightful Corporation
Edited sentence: Most programs written in S-plus will run in an R environment.S-PLUS is an advanced statistics package built upon the S programming language.S-plus is very similar to R, the open source implementation of the S language.S-plus's full featured object-oriented programming capabilities and advanced analytical algorithms are slowly enabling it to become a fierce competitor to the SAS System.Sold by Insightful Corporation, S-Plus is a value-added commercial implementation of the S language, originally developed at AT&T Bell Labs