Complex sentence: His next hit was "Blabbermouth" which was re-released in Australia only to cash in on Crash's success, it was first released in 1958, when Craddock was virtually unknown.
Split into simpler sentences: His next hit was "Blabbermouth" which was re-released in Australia only to cash in on Crash's success. It had been first released in 1958, when Craddock was virtually unknown.