Complex sentence: During that period, another Stockholm-based video game development studio, Starbreeze Studios, announced that they would acquire Rock Solid, but the agreement between the two companies was ultimately broken by Starbreeze, and the acquisition was stopped.
Split into simpler sentences: During that period, another Stockholm-based video game development studio, Starbreeze Studios, announced that they would acquire Rock Solid. However, the agreement between the two companies was ultimately broken by Starbreeze, and the acquisition was stopped.