Complex sentence: These waters generally extend from three nautical miles off the coast to the outer limit of Australia's Exclusive Economic Zone at 200 nautical miles while marine protected areas located closer in-shore are the responsibility of the states or the Northern Territory.
Split into simpler sentences: These waters generally extend from three nautical miles off the coast to the outer limit of Australia's Exclusive Economic Zone (200 nautical miles). Marine reserves closer in-shore are the responsibility of the states or the Northern Territory.