Simplify the following text for a Grade 7 native English-speaking person.
Original: Little is known about their distribution in New Guinea , they have been found in southern New Guinea between Merauke in the west , to the Kelp Welsh River , east of Port Moresby in the east , where they may be found in open woodland .
Simplified: Little is known about their distribution in New Guinea . They have been found in southern New Guinea between Merauke in the west and the Kelp Welsh River , east of Port Moresby , in the east , where they may be found in open woodland .