Complex sentence: The middle altitude foothills of the Himalaya between about 2000-2500 m form the boundary between the Palearctic and Indomalaya ecoregions, and further east in eastern Asia, high mountain ranges form tongues of Palearctic flora and fauna in northern Myanmar and southern China.
Split into simpler sentences: The middle altitude foothills of the Himalaya between about 2000-2500 m form the boundary between the Palearctic and Indomalaya ecoregions. In Southeastern Asia, high mountain ranges form tongues of Palearctic flora and fauna in northern Myanmar and southern China.