Complex sentence: One of the findings of the Johnston and McClelland report in 1974 was that the word superiority effect does not occur inevitably whenever we compare a word and a non-word, and rather depends somewhat upon the strategies the subjects bring to the task they are performing.
Split into simpler sentences: One of the findings of the Johnston and McClelland report was that the word superiority effect does not occur inevitably whenever we compare a word and a non-word. Rather it depends somewhat upon the strategies the subjects bring to the task they are performing.