Complex sentence: The game of Go (Chinese: 圍棋, Pinyin: Weiqi) originated in China at an unknown time; by the 4th century BC it was a worthy pastime for a gentleman, as described in the Analects of Confucius.
Split into simpler sentences: The game of Go (Chinese: 圍棋, Pinyin: Weiqi) originated in China. No one knows when the first game was played, but by the 4th century BC it was considered a worthy pastime for a gentleman, and described as such in the Analects of Confucius.