In the aftermath of Iran’s deal earlier this month with international powers to end sanctions, investors like Hans Humes are anticipating new bonds from Iran. As Iranian officials were in Vienna hammering out terms of the nuclear accord, Humes, a New York-based hedge fund manager, said he’d be a buyer when the nation starts selling debt to finance projects that weren’t viable under the sanctions. Before Iran can access overseas markets, the U.S. and European Union will need to lift a complex web of sanctions, which mainly include a ban on its lenders from dealing with Iran and Iranian banks’ access to the leading global financial-messaging system known as Swift.