Complex sentence: Blair died in 1945 and licenses continued to lease the location and paid royalties for use of the Kewpee name from the estate until the Kewpee trademark went up for sale in 1955 and Blair estate owned locations went up for sale in 1958.
Split into simpler sentences: Blair died in 1945 and licensees continued to lease their locations and paid royalties for use of the Kewpee name from the estate until the Kewpee trademark went up for sale in 1955. The Blair estate owned locations went up for sale in 1958.