Complex sentence: On 12 March, they reached Stanley Pool (now Pool Malebo), the site of the present day cities Kinshasa and Brazzaville, capitals of the Democratic Republic of the Congo and the Republic of the Congo.
Split into simpler sentences: On 12 March, they reached Stanley Pool (now Pool Malebo). This is the site of the present day cities Kinshasa and Brazzaville, capitals of the Democratic Republic of the Congo and the Republic of the Congo.