Complex sentence: Blackburne searched for the perfect rubbing compound until one day, according to legend, he found mud he liked in a secret tributary of the Delaware River, near Palmyra, New Jersey where he lived most of his life.
Split into simpler sentences: Blackburne searched for the perfect rubbing compound until one day, according to legend, he found mud he liked. The actual location has never been revealed, but rumor says it was from a tributary of the Delaware River, near Palmyra, New Jersey where he lived most of his life.