Complex sentence: One year later, a Galyan's Trading Company store was added onto the mall as well, which converted to Dick's Sporting Goods in 2004 following the acquisition of the Galyan's chain.
Split into simpler sentences: One year later, a Galyan's Trading Company store was added onto the mall as well. The store was eventually converted to Dick's Sporting Goods in 2004 following the acquisition of the Galyan's chain.