Complex sentence: The Siamang inhabits the forest remnants of Sumatra Island and the Malay Peninsula, and is widely distributed from lowland forest to montane forest--even a rainforest--and can be found at altitudes of up to 3800 m. Rowe, Noel.
Split into simpler sentences: The Siamang inhabits the forest remnants of Sumatra Island and the Malay Peninsula, and is widely distributed from lowland forest to montane forest, even a rainforest. And can be found at altitudes of up to 3800 m. Rowe, Noel.