Simplify the following text for a Grade 11 native English-speaking person.
Original: East Punjab or Khalistan was a region of India , that was separated from West Punjab , which became an integral part of Pakistan by the Radcliffe Line after the 1947 Partition of India .
Simplified: East Punjab was the part of the Punjab region that went to India following the Partition of the British province of the Punjab between India and Pakistan in 1947 .