Complex sentence: Strategic crude oil storages are at 3 underground locations in Mangalore, Visakhapatnam and Padur near Udupi are located on the east and west coasts of India are readily accessible to the refineries.
Split into simpler sentences: Strategic crude oil storages are at 3 underground locations in Mangalore, Visakhapatnam and Padur (nr Udupi). All these are located on the east and west coasts of India which are readily accessible to the refineries.