Complex sentence: In 1904, O'Leary began operating illegal gambling on Lake Michigan with the steamship "The City of Traverse" however without police protection the ship soon went out of business in 1907 due to repreated police raids after the ship had docked.
Split into simpler sentences: In 1904, O'Leary began operating illegal gambling on Lake Michigan with the steamship "The City of Traverse". However, without police protection, the ship soon went out of business by 1907 due to repreated police raids whenever the ship had docked.