Complex sentence: Accel Partners invested $12 million in Supercell in 2011, and in October 2013 it was announced that Japanese company GungHo Online Entertainment and its parent SoftBank had acquired 51% of the company for a reported $2.1 billion.
Split into simpler sentences: Accel Partners invested $12 million in Supercell in 2011. In October 2013 it was announced that Japanese company GungHo Online Entertainment and its parent SoftBank had acquired 51% of the company for a reported $2.1 billion.