Complex sentence: The Dutch moved into the capital on January 1874 believing the Acehnese to have surrendered; however, the conflict moved into the countryside, and the Acehnese continued to actively oppose Dutch rule.
Split into simpler sentences: The Dutch moved into the capital on January 1874 believing the Acehnese to now surrender. However, the conflict moved into the country side and the Acehnese continued to actively oppose Dutch rule.