Complex sentence: In early 2013, Levine came across a pair of 1940s headphones at a Washington, DC museum, and because they had been built with high quality materials such as leather and metal, they remained operational.
Split into simpler sentences: In early 2013, Levine came across a pair of "impeccably crafted" 1940s headphones at a Washington, DC museum. Because they had been built with high quality materials such as leather and metal, they remained operational.