Complex sentence: Within the United States, interest in British-style brass bands grew in the 1970s due in part to the UK bands Grimethorpe and Cory touring parts of the Midwest and Eastern Seaboard during the bicentennial celebrations in 1976.
Split into simpler sentences: Within the United States, interest in British-style brass bands grew in the 1970s. This may have been due in part to the UK bands Grimethorpe and Cory touring parts of the Midwest and Eastern Seaboard during the bicentennial celebrations in 1976.