A simple lifestyle can encompass many aspects of life and styles of simplicity.
Many frugal activities are quite complex and actually make life more difficult.
Living frugally is not usually the easiest choice. It involves creativity, thoughtfulness and often a great deal of hard work to make it a reality. But easy is not the only definition for the word simple. I believe in other senses of the word, people who are choosing to live frugally can be choosing to live simply, as well. We ought to be frugal not only in the expenditure of money and of goods, but in the employment of time.