Complex sentence: After that he had only one further race, at the beginning of the 1815 flat season, in which he placed second, and was then retired to stud at Marclaud's near Farnham.
Split into simpler sentences: After that he had only one further race, at the beginning of the 1815 flat season, in which he placed second. He was then retired to stud at Marclaud's near Farnham.