Complex sentence: From 1974 to 1977 the Firebirds were a member club of the North American Hockey League winning the league's Lockhart Cup play-off championship in 1976.
Split into simpler sentences: From 1974 to 1977 the Firebirds were a member club of the North American Hockey League. The Firebirds won the league's Lockhart Cup play-off championship in 1976.