Complex sentence: It was one of several locations on Oxford Street where his father ran a book-selling business for 35 years, from 1784; their home and business had to move down Oxford Street when Regent Street and Oxford Circus were created in 1814.
Split into simpler sentences: It was one of several locations on Oxford Street where his father ran a book-selling business for 35 years, from 1784. They had to move down Oxford Street when Regent Street and Oxford Circus were created in 1814.