{HEAD ~ The method} 1, wherein {TAIL ~ the splitting} up includes splitting up the remaining fraction high in plastics into the light fraction and the heavy fraction by air sifting 
wherein
{ HEAD ~ The method } 1 , wherein { TAIL ~ the splitting } up includes splitting up the remaining fraction high in plastics into the light fraction and the heavy fraction by air sifting
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH