Complex sentence: At around the same time, Shaun and Danny Harris, sons of composer Roy Harris and pianist Johana Harris, also moved to Los Angeles, and by 1963 had both begun playing with a teen surf band, The Snowmen.
Split into simpler sentences: At around the same time Shaun and Danny Harris sons of composer Roy Harris and pianist Johana Harris, also moved to Los Angeles. By 1963 they had both begun playing with a teen surf band, The Snowmen.