While I'm not a huge fan of pay sites that essentially lock out those of us who choose not to feed the machine, I have seen this a number of times and honestly never know how much of it to cut and how much to save. I believe there is a certain value to these GEDCOM source notations that Ancestry litters across the profiles, but I suspect that 90% of it could be cut away and leave just the key indicators behind. Unfortunately, I'm not an Ancestry GEDCOM expert, so I'll leave this to those with more experience. But my take is that typically I'll leave it alone, or on an Ancestry free weekend if I come across one, I'll follow the links back and validate and even try to clean up parts so that it's more meaningful.
From what I can tell, it appears to be referencing a specific public (possibly private) Ancestry Family Tree and referencing the sources located within that tree. Other than that, there does appear to be a significant amount of "field" indicators that don't seem to go anywhere or have blank data in them.