Draw or select the 3 parts of a one gpx file

Hello I have a gpx file ( from T.E.T bulgaria ) it’s a one file but contains 3 differents parts. most softwares draw the whole track, but I can only have the first part here. how can I do to have all parts or select one of the three… ?
you can test the gpx , which is on this page

thanks for your help

Please try to convert to GeoJSON or KML and try again. The uploader function doesn’t really have priority for us, sorry.