“Nobody knew that health care could be so complicated.” So declared Donald Trump three weeks before wimping out on his promise to repeal Obamacare. Up next: “Nobody knew that tax reform could be so complicated.” Then, perhaps: “Nobody knew that international trade policy could be so complicated.” And so on.
Actually, though, health care isn't all that complicated. Basically, you need to induce people who don't currently need medical treatment to pay the bills for those who do, with the promise that the favor will be returned if necessary.