Complex sentence: Mu was born in Bengbu (蚌埠), Anhui (安徽) in 1921 and attended secondary school in Henan (河南) until 1937 when the Japanese invasion started.
Split into simpler sentences: Mu was born in Bengbu (蚌埠), Anhui (安徽) in 1921. He attended secondary school in Henan (河南) until 1937 when the Japanese invasion started.