Complex sentence: India has some of the world's most biodiverse ecozones--desert, high mountains, highlands, tropical and temperate forests, swamplands, plains, grasslands, areas surrounding rivers, and island archipelago.
Split into simpler sentences: India has some of the world's most biodiverse regions. The political boundaries of India encompass a wide range of ecozones--desert, high mountains, highlands, tropical and temperate forests, swamplands, plains, grasslands, areas surrounding rivers, as well as island archipelago.