Complex sentence: Under Arlen's ownership, Korvette's stores deteriorated and lost market share relative to other retailers to the point that the company was worth more for its real estate assets (such as its ownership or leasehold interests in valuable locations) than its retail sales.
Split into simpler sentences: Under Arlen's ownership, Korvette's stores deteriorated and lost market share relative to other retailers. Soon the company soon became worth more for its real estate assets (such as its ownership or leasehold interests in valuable locations) than its retail sales.