Original: K.A. Nilakanta Sastri, A History of South India, p 5 Under Rajaraja Chola I and his son Rajendra Chola I, the dynasty became a military, economic and cultural power in South Asia and South-east Asia.
Simplified: Under Rajaraja Chola I (Rajaraja the Great) and his son Rajendra Chola, the dynasty became a military, economic and cultural power in Asia.