Complex sentence: Founded in 1941 by David Stuart and later acquired by Marili Morden and Nesuhi Ertegun, the label and its namesake--an influential record shop in Hollywood, California--were in the vanguard of an international revival of traditional New Orleans jazz in the 1940s.
Split into simpler sentences: Founded in 1941 by David Stuart and later acquired by Marili Morden and Nesuhi Ertegun, the label was devoted to traditional New Orleans-style jazz. Jazz Man Records and the Hollywood shop that was its namesake were in the vanguard of an international revival of traditional New Orleans jazz in the 1940s.