Complex sentence: In the late 1960s Scruggs was contracted by the Vega Company in Boston to design and endorse a new banjo to be called "The Earl Scruggs Model" which was the top of the line of the banjos they produced.
Split into simpler sentences: In the late 1960s Scruggs was contracted by the Vega Company in Boston to design and endorse a new banjo to be called "The Earl Scruggs Model". The Scruggs model was the top of the line of the banjos they produced.