Complex sentence: The Eureka Brass Band was a brass band from New Orleans, active from 1920 to 1975, that recorded prolifically for Atlantic Records, Pax, Alamac, Folkways, Jazzology, and Sounds of New Orleans.
Split into simpler sentences: The Eureka Brass Band was a brass band from New Orleans, active from 1920 to 1975. They recorded prolifically, for Pax, Alamac, Folkways, Jazzology, and Sounds of New Orleans.