Complex sentence: His promotion to full general is believed to have been blocked by Mountbatten and he retired from the army in January 1947 and became a noted horticulturist, writing books on cacti and keeping a well noted garden at his house, Lower Hall in Worfield, Shropshire.
Split into simpler sentences: His promotion to full general is believed to have been blocked by Mountbatten and he retired from the army in January 1947. Leese became a noted horticulturist, writing books on cacti and keeping a well noted garden at his house, Lower Hall in Worfield, Shropshire.