Complex sentence: He began publishing on his own in 1790 at Bond Street in London; he retired in 1812, aged 42, selling his business and 50 Albemarle Street, his London home, to John Murray, the second publisher of that name.
Split into simpler sentences: He began publishing on his own in 1790 at Bond Street in London. In 1812 he retired, aged 42, selling his business and 50 Albemarle Street, his London home, to John Murray, the second publisher of that name.