Simplify the following text for a Grade 12 native English-speaking person.
Original: The 2010 Pakistan floods began in late July 2010 , resulting from heavy monsoon rains in the Khyber Pakhtunkhwa , Sindh , Pakistani Punjab and Balochistan regions of Pakistan and affected the Indus River basin .
Simplified: The 2010 Pakistan floods began in late July 2010 , resulting from heavy monsoon rains in the Khyber Pakhtunkhwa , Sindh , Punjab and Balochistan regions of Pakistan and affected the Indus River basin .