Original sentence: The author(s) and editor(s) of John may have known the content of synoptics, but did not use them in the way that Matthew and Luke used their Markan source.The authors of Matthew and Luke, acting independently, used Mark (or a source document Mark also used) for their narrative of Jesus's career, supplementing it with the collection of sayings called the Q document and additional material unique to each called the M source (Matthew) and the L source (Luke).There is a longstanding theory that this gospel had its origins as a "signs" source (or gospel) that was later expanded with a Passion narrative and a series of discourses
Edited sentence: The authors and editors of John may have known the synoptics, but did not use them in the way that Matthew and Luke used Mark.The authors of Matthew and Luke, acting independently, used Mark for their narrative of Jesus's career, supplementing it with the collection of sayings called the Q document and additional material unique to each called the M source (Matthew) and the L source (Luke).There is a near-consensus that this gospel had its origins as a "signs" source (or gospel) that circulated within the Johannine community (the community that produced John and the three epistles associated with the name), later expanded with a Passion narrative and a series of discourses