Complex sentence: It is the fourth largest city in Western province, after Colombo, Negombo and Kalutara and is the second urban city, after Negombo in Gampaha District, situated on the north of Colombo.
Split into simpler sentences: It is the fourth largest city in Western province, after Colombo, Negombo and Kalutara. Gampaha is the second urban city, after Negombo in Gampaha District, situated on the north of Colombo.