Complex sentence: Early canonical scholars included Ronald Knox in Britain (credited with inventing "the Game") and Christopher Morley in New York, who founded the Baker Street Irregulars--the first society devoted to the Holmes canon--in 1934.
Split into simpler sentences: Early canonical scholars included Ronald Knox in Britain and Christopher Morley in New York. Morley founded the Baker Street Irregulars--the first society devoted to the Holmes canon--in 1934.