I am sure this varies from person to person, my simple life might seem like a whole heap of drama for someone else. But in my world, a simpler life for me would be :-
a) more time to read
b) less urge to shop and buy things, clothes, take away coffee, small things that add up to a lot, that I pretend not to notice I buy.
c) more quality time with my family
d) less reliance on the outside world, such as no need to have a television, buy magazines, use mass produced things, no need for buying things I allow society to tell me I need.
e) more silence
f) more solitude
g) less internet time, maybe one hour a day maximum
e) no coffee in my world at all, but lots of green tea
f) time to sleep
There is more I am sure, but these are the first things I aim for in spending time doing less.