Complex sentence: Every year 8 million metric tons − or one garbage truck load per minute − of plastic waste leaks into the ocean and make it into the circular ocean currents and now contaminates sediments at the very bottom of the sea and is embeddeded in the aquatic food chain.
Split into simpler sentences: Every year 8 million metric tons of plastic waste leaks into the ocean and make it into the circular ocean currents. This causes contamination to sediments at the very bottom of the sea and sees plastic waste embeddeded in the aquatic food chain.