Complex sentence: Henry Gregory (1744-1782) was a mathematical and optical instrument maker in business from c.1750-92 from premises in Francis Court, Clerkenwell, London and an establishment known as "The Azimuth Compass" in Leadenhall Street, London.
Split into simpler sentences: Henry Gregory (1744-1782) was a mathematical and optical instrument maker. He was in business from c.1750--1792 from premises in Francis Court, Clerkenwell, London and an establishment known as "The Azimuth Compass" in Leadenhall Street, London.