Complex sentence: Mrs Harry Thrower was left a widow for 35 years and at first worked in the house as a housekeeper but later she ran a shop in Little Horwood, on only retired in 1971 because she refused to adopt decimalisation.
Split into simpler sentences: Mrs Harry Thrower was left a widow for 35 years. At first she worked in the house as a housekeeper, but later she ran a shop in Little Horwood, only retiring in 1971 because she refused to adopt decimalisation.