Complex sentence: The park consists of two geographic systems: a steep mountainous interior where there are more than 500 bird species and 22 endemic species and a coastal area with bays, beaches and resorts with huge tourism potential.
Split into simpler sentences: The park consists of two geographic systems: a steep mountain, where there are more than 500 bird species and 22 endemic species. The second system is the coastal area with bays, beaches and resorts of a huge tourism potential.