Complex sentence: Kaysone Phomvihane was born in Savannakhet, he became an active revolutionary while studying in Indochina capital Hà Nội during the 1940s.
Split into simpler sentences: Kaysone Phomvihane was born in Savannakhet. He became an active revolutionary while studying in Indochina capital Hà Nội during the 1940s.