Complex sentence: His grandfather, Albert Porter, was head of the interior design department at Harrods for over 30 years from 1949-1985, his most well known commission being the complete interior design of the house of Brian Epstein, the Beatles manager in 1965.
Split into simpler sentences: His grandfather, Albert Porter, was head of the interior design department at Harrods for over 30 years from 1949-1985. Porter's most well known commission being the complete interior design of the house of Brian Epstein, the Beatles manager in 1965.