Complex sentence: The global demand for palm oil is blamed for the cause of tropical hardwood forests are being cleared for palm oil plantations and the distruction of orangutan habitat in countries such as Borneo and Sumatra.
Split into simpler sentences: The global demand for palm oil is blamed for the loss of tropical hardwood forests which are being cleared for palm oil plantations. This clearance leads to the distruction of orangutan habitat in countries such as Borneo and Sumatra.