Complex sentence: It was acquired by Eidos Interactive, a British video game publisher, in 1998 and, following Square Enix's acquisition of Eidos in 2009, is now a subsidiary of Square Enix.
Split into simpler sentences: It was acquired by Eidos Interactive, a British video game publisher, in 1998. After Square Enix's acquisition of Eidos in 2009, it became a subsidiary of Square Enix.