Complex sentence: The wine acquires its characteristic yellow color and nutty flavors as it ages for the requisite time of six years and three months, the time that must elapse between harvest and bottling, although at certain points during this time the wine is not necessarily in the cask.
Split into simpler sentences: The wine acquires its characteristic yellow color and nutty flavors as it ages for the requisite time of six years and three months, the time that must elapse between harvest and bottling. Although, at certain points during this time, the wine is not necessarily in the cask.