Complex sentence: It was thought that, like most radio shows of the time, the episodes had not been recorded and the episodes were thought lost until 1988, when 25 of the 26 scripts were rediscovered in the Library of Congress storage and republished.
Split into simpler sentences: It was thought that, like most radio shows of the time, the episodes had not been recorded. The episodes were thought lost until 1988, when 25 of the 26 scripts were rediscovered in the Library of Congress storage and republished.