Complex sentence: In addition to being Benin's largest city, it is also the seat of government (even though Porto-Novo is the official capital); it is home to most of the country's government buildings and diplomatic services.
Split into simpler sentences: In addition to being Benin's largest city, it is also the seat of government, although Porto-Novo is the official capital. It is home to most of the country's government buildings and diplomatic services.