Complex sentence: It has been a generation since Harry Markowitz laid the foundations and built much of the structure of what we now know as MPT, the greatest contribution of which is the establishment of a formal risk/return framework for investment decision-making.
Split into simpler sentences: It has been a generation since Harry Markowitz laid the foundations and built much of the structure of what we now know as MPT. The greatest contribution of MPT is the establishment of a formal risk/return framework for investment decision-making.