Complex sentence: When the Duluth, Missabe and Iron Range Railway laid tracks extending the rails from Tower to Ely in 1888, Ely began mining operations with the opening of the Chandler Mine, shipping the ore to docks on Lake Superior in Two Harbors and Duluth.
Split into simpler sentences: When the Duluth, Missabe and Iron Range Railway laid tracks extending the rails from Tower to Ely in 1888, Ely began mining operations with the opening of the Chandler Mine. Ore was shipped by rail to docks on Lake Superior in Two Harbors and Duluth.