Complex sentence: The 2004-05 NHL season was scheduled to have been 88th regular season of the National Hockey League (NHL) but it was officially canceled on February 16,2005 due to an unresolved lockout that began on September 16,2004.
Split into simpler sentences: The 2004-05 NHL season would have been the 88th regular season of the National Hockey League (NHL). The season was officially canceled on February 16,2005 due to an unresolved lockout that began on September 16,2004.