Complex sentence: Tourism and recreational activities account for an array of plastics being discarded along beaches and coastal resorts, although it is worth noting that marine debris observed on beaches will also arise from beaching of materials carried on in-shore-and ocean currents.
Split into simpler sentences: Tourism and recreational activities account for an array of plastics being discarded along beaches and coastal resorts. It is worth noting that marine debris observed on beaches also arise from beaching of materials carried on in-shore-and ocean currents.