Complex sentence: As a result tourism has become Malaysia's third largest source of income from foreign exchange, although it is threatened by the negative effects of the growing industrial economy, with large amounts of air and water pollution along with deforestation affecting tourism.
Split into simpler sentences: As a result tourism has become Malaysia's third largest source of income from foreign exchange. In recent years tourism has been threatened by the negative effects of the growing industrial economy, with large amounts of air and water pollution along with deforestation affecting tourism.