Original sentence: He was born in 1952 and is the son of John Horace Ragnar Colvin and grandson of Ragnar Colvin
Edited sentence: Brenda Colvin (1897-1981) was an important landscape architect, author of standard works in the field and a force behind its professionalisation.He is the great-grandson of the Whitehall mandarin Clement Sneyd Colvin, whose father was John Russell Colvin.John Russell, son of a East Indies trader, ended up lieutenant-governor of the North-West Provinces of British India during the mutiny of 1857, had ten children and founded a dynasty of Empire-builders.Mark Colvin is the son of John Horace Ragnar Colvin , the Cold War diplomat, and the grandson of Admiral Sir Ragnar Colvin, KBE, CB.Relatives included Walter Mytton and Auckland, also lieutenant-governor of the North-West Provinces and Oudh.Sidney Colvin was a critic, curator, and great friend of Robert Louis Stevenson.The Colvins had a long history of service to Queen and country (and British Empire), both in the military and administration