Basically, the company had to pay for its own buyout when private equity firms KKL, Vornado, and Bain bought the company for $6.6 billion, mostly with loans.
Because the company then had to pay off those extreme loans, they were forced to sell off their assets and property, which they leased back from the very private equity firms that now owned them.
The same thing happened more recently with Red Lobster and JoAnn Fabrics.
The methods that they use to do this are crazy (installing a hostile executive, naked short selling, etc), the fact that they got caught while doing it to gamestop caused some crazy shit to be brought to light, and nearly wiped out the entire market