Complex sentence: Mr. Dooley (full name Martin J. Dooley) was a fictional Irish immigrant bartender created by American journalist Finley Peter Dunne, the subject of a large number of Dunne columns between 1893 and 1915, and then again in 1924 and 1926.
Split into simpler sentences: Mr. Dooley (full name Martin J. Dooley) is a fictional Irish immigrant bartender created by American journalist Finley Peter Dunne. Dooley was the subject of a large number of Dunne columns between 1893 and 1915, and then again in 1924 and 1926.