Complex sentence: There was a rumour that the entire festival was a fabrication by the landlord of The Ship Inn in the 1950s, however festivities had been recorded by Morton Nance, an author on the Cornish language, in 1927 in the magazine "Old Cornwall".
Split into simpler sentences: There was a rumour that the entire festival was a fabrication by the landlord of The Ship Inn in the 1950s. However, festivities had been recorded by Morton Nance, an author on the Cornish language, in 1927 in the magazine "Old Cornwall".