Complex sentence: The diversity of species is not limited to the hot lowlands but in the higher altitudes as well with mesophile forests, oak/pine forests in the Los Altos, Northern Mountains and Sierra Madre and the extensive estuaries and mangrove wetlands along the coast.
Split into simpler sentences: The diversity of species is not limited to the hot lowlands. The higher altitudes also have mesophile forests, oak/pine forests in the Los Altos, Northern Mountains and Sierra Madre and the extensive estuaries and mangrove wetlands along the coast.