Complex sentence: Using a short-lived fish, "Nothobranchius furzeri", with a median life span of nine weeks, they found a maximal dose of resveratrol increased the median lifespan by 56%.
Split into simpler sentences: Using a short-lived fish, "Nothobranchius furzeri", with a median life span of nine weeks. They found a maximal dose of resveratrol increased the median lifespan by 56%.