Complex sentence: Mao enthusiastically agreed with this decision, arguing for an alliance across China's socio-economic classes; a vocal anti-imperialist, in his writings he lambasted the governments of Japan, UK and US, describing the latter as "the most murderous of hangmen".
Split into simpler sentences: Mao enthusiastically agreed with this decision, arguing for an alliance across China's socio-economic classes. Mao was a vocal anti-imperialist and in his writings he lambasted the governments of Japan, UK and US, describing the latter as "the most murderous of hangmen".