Complex sentence: Due to the fact that classic European events such as Paris-Nice and Tirreno-Adriatico start during Vuelta Mexico Telmex almost certainly means that the race will never be upgraded to 2.HC for as long as it exists extending into the second week of March.
Split into simpler sentences: Due to the fact that classic European events such as Paris-Nice and Tirreno-Adriatico start during Vuelta Mexico Telmex, it almost certainly means that the race will never be upgraded to 2.HC. This is particularly the case as long as it exists extending into the second week of March.