Simplify the following text for a Grade 6 native English-speaking person.
Original: The Great Pyramid of Giza ( also called the Pyramid of Khufu and the Pyramid of Cheops ) is the oldest and largest of the three pyramids in the Giza Necropolis bordering what is now El Giza , Egypt .
Simplified: The Great Pyramid of Giza is a huge pyramid built by the Ancient Egyptians .