Complex sentence: The MacNeil siblings are from Cape Breton Island and began performing together in 1980, while they were still teenagers (Lucy MacNeil being only 10 years old); consequently, they were only able to perform on weekends, and toured during school holidays.
Split into simpler sentences: The MacNeil siblings are from Cape Breton Island and began performing together in 1980, while they were still teenagers (Lucy MacNeil being only 10 years old). Consequently, they were only able to perform on weekends, and toured during school holidays.