Complex sentence: The vegetation is largely dense jungle and the climate largely hot and humid, although the higher parts are cold, and around Kokoda and the northern beaches as the terrain lowers towards sea level, the terrain consists mainly of thick kunai grass and swamps.
Split into simpler sentences: The vegetation is largely dense jungle and the climate mostly hot and humid, although the higher parts are cold. Around Kokoda and the northern beaches, as the terrain lowers towards sea level, the terrain consists mainly of thick kunai grass and swamps.