On Tuesday evening, Circuit Arts presented a 50th-anniversary screening of Susanna Styron’s documentary “Suspended Sentence,” about off-season life on Martha’s Vineyard in 1976. The black-and-white 25-minute doc, filmed less than two years after “Jaws” came out, depicts the bleak beauty of the natural world and the reality of Island life. Circuit Arts presented a 50th-anniversary screening of Susanna Styron’s documentary “Suspended Sentence.” —Courtesy Circuit ArtsAfter the screening, Styron discussed the documentary with NPR journalist Mara Liasson. This was a coming-full-circle for them; as an intern at the Vineyard Gazette, Liasson’s first front-page article was a piece she wrote on the premiere of “Suspended Sentence.”