Complex sentence: Chess is believed to have originated in India, some time before the 7th century; the Indian game of chaturanga is also the likely ancestor of the Eastern strategy games xiangqi, janggi and shogi.
Split into simpler sentences: Chess is believed to have originated in India, some time before the 7th century, being derived from the Indian game of chaturanga. Chaturanga is also the likely ancestor of the Eastern strategy games xiangqi, janggi and shogi.