Original: He thought about calling Dubliners by the name Ulysses in Dublin, but the idea grew from a story in Dubliners in 1906, to a "short book" in 1907, to the vast novel that he began in 1914.
Simplified: (6) He thought about calling Dubliners by the name Ulysses in Dublin, (7) but the idea grew from a story in Dubliners in 1906, to a 'short book' in 1907, (8) to the vast novel which he began writing in 1914.