Complex sentence: During this time Howie was invited to perform at the Hayloft Jamboree in Boston, Massachusetts as well as the Hayloft Jamboree in Charleston, West Virginia working side by side with such notables as Harkshaw Hawkins, Web Pierce, and Lefty Purcell.
Split into simpler sentences: During this time Howie was invited to perform at the Hayloft Jamboree in Boston, Massachusetts as well as the Hayloft Jamboree in Charleston, West Virginia. He worked side by side with such notables as Harkshaw Hawkins, Web Pierce, and Lefty Purcell.