Complex sentence: It is located on the banks of Cooum river about northwest of Chennai (Madras), the capital city of Tamil Nadu and located in Chennai City.It is the administrative headquarters of Tiruvallur district.
Split into simpler sentences: It is located on the banks of Cooum river about northwest of Chennai (Madras), the capital city of Tamil Nadu. Tiruvallur is located in Chennai City.It is the administrative headquarters of Tiruvallur district.