Original sentence: In 1876 Italian explorer, Luigi D'Albertis, was the first person to successfully attempt this when he travelled 900 km into the interior of New Guinea, in his steamer, Neva.The estuary of the Fly River is 56 km wide at its entrance, but only 11 km wide abreast Kiwai Island, which may be considered as being the river mouth
Edited sentence: In 1876 Italian explorer, Luigi D'Albertis, was the first person to successfully attempt this when he travelled 900 km into the interior of New Guinea, in his steamer, Neva.The estuary of the Fly River is 56 km wide at its entrance, but only 11 km wide abreast Kiwai Island, which may be considered as being the river mouth