Complex sentence: Seeing that the Siamese and Vietnamese overlords had gotten Cambodia into civil strife, the French forced King Norodom to return to Odong in 1863 and sign a treaty of protection with France, which transferred the country from Siamese and Vietnamese to French colonial rule.
Split into simpler sentences: Seeing that the Siamese and Vietnamese overlords had gotten Cambodia into civil strife, the French forced King Norodom to return to Odong in 1863 and sign a treaty of protection with France. This transferred the country from Siamese and Vietnamese to French colonial rule.