Complex sentence: Lowe made further improvements to the estate (such as the creation of a fish pond from the existing Tottle Brooke) up until 1920 when the land was purchased by Sir Jesse Boot (also known as Lord Trent) the founder of the Boot's the Chemist.
Split into simpler sentences: Lowe made further improvements to the estate, the creation of a fish pond from the existing Tottle Brooke being one example. He retained ownership up until 1920 when the land was purchased by Sir Jesse Boot (also known as Lord Trent) the founder of the Boot's the Chemist.