Complex sentence: Brunei-Muara is the northern-most district (in Malay) in Brunei; it is the smallest of Brunei's four districts in term of area but by far the most populous, with over half the country's population.
Split into simpler sentences: Brunei-Muara is the northern-most district (in Malay) in Brunei. It is the smallest of Brunei's four districts in term of area but by far the most populous, with over half the country's population.