You're right - he did do one thing: he oversaw the greatest scandal in the history of the VA system.
Outside of that - nada.
When exactly did he "oversee the greatest scandal in the history of the VA" was it before he was chairman of the VA (2013-2014)?
Was this before or after he spearheaded a bipartisan effort to pass the most comprehensive veterans’ legislation in decades? The Veterans Access, Choice and Accountability Act increases accountability within the VA and ensures that all veterans have access to timely health care.
The law
written by Sanders strengthens the VA health care system by authorizing 27 new medical facilities and by providing $5 billion to hire more doctors and nurses to care for the surging number of veterans returning from wars in Iraq and Afghanistan. It provides incentives to attract young doctors to the VA. It makes it easier for some veterans to see private doctors or go to community health centers, Department of Defense facilities or Indian Health Centers. It expanded VA educational benefits and improved care for survivors of sexual trauma while serving in the military.
...or was it before he was praised by John McCain and Sen. Jack Reed for overhauling the Veterans Administration. Was said to have done such an excellent job of bringing all parties to a deal, that it wouldn’t have gotten done without Sanders’ work.
I'll repeat, I think some here should really do their homework.
I also think that a Socialist Country & a Capitalist economy aren't mutually exclusive and help make America great once again, that's just my opinion.