I am reading Value-at-Risk Second Edition – by Glyn A. Holton
https://www.value-at-risk.net/futures-nearbys-and-distortions/
From 6.6.1 "The standard means of obtaining continual time series from futures prices is to use nearby series or simply nearbys."
In 6.6.2 (see link above) there is a guide for creating a return-adjusted nearby, I'm not sure I understand without an example. Does it mean that returns are created only for each separate contract in a nearby (not from the end of one to the start of another), and then these series of returns are multiplied by a series of historical prices, to get approximate historical prices? How exactly is this implemented?