Simplify the following text for a Grade 5 native English-speaking person.
Original: The mainland of the country is the eastern half of New Guinea island , where the largest towns are also located , including the capital Port Moresby and Lae ; other major islands within Papua New Guinea include New Ireland , New Britain , Manus and Bougainville .
Simplified: It contains the east half of New Guinea island and some more nearby islands . The capital city of Papua New Guinea is Port Moresby .