Complex sentence: In June 2006 Federated converted the Lord & Taylor branch into a Macy's after Simon announced an agreement with Nordstrom to open a store in 2009 at Northshore Mall.
Split into simpler sentences: In June 2006 Federated converted the Lord & Taylor branch into a Macy's after Nordstrom had announced they would open a location at the mall. Simon had already announced an agreement with Nordstrom to open a store in 2009 at Northshore Mall.