Original sentence: He is also the author of two well received books on a variation of the Sicilian Defence known as the Dragon Variation in additon to a number of other books on chess.He won the British Championship in 1996
Edited sentence: He has written numerous other opening books, some good, some bad (unusual queens pawn defences springs to mind).He is also the author of two well received books on a sub-variation of the Sicilian Defence known as the Dragon.He maintains a website on the B70 Sicilian, Dragon variation.He won the British Champion in 1996