Complex sentence: Part of Apple's effort to maintain the Mac platform was trying to improve its retail strategy; to this end, Apple secured a deal with CompUSA to set up a "store within a store" section at many CompUSA locations.
Split into simpler sentences: Part of Apple's effort to maintain the Mac platform was trying to improve its retail strategy. To this end, Apple secured a deal with CompUSA to set up a "store within a store" section at many CompUSA locations.