Complex sentence: The Seahawks, meanwhile, temporarily relocated to Husky Stadium following the 1999 season while the Kingdome was demolished, their new stadium, CenturyLink Field, was being built on the Kingdome's footprint, and would open on time for the 2002 NFL season.
Split into simpler sentences: The Seahawks, meanwhile, temporarily relocated to Husky Stadium following the 1999 season. While the Kingdome was demolished, their new stadium, CenturyLink Field, was being built on the Kingdome's footprint, and would open on time for the 2002 NFL season.