Our Parsha opens by giving Sarah Imeinu’s age upon her death:
“Sarah’s lifetime was one hundred years, twenty years, and seven years: the years of Sarah’s life.” (Sefer Breish’t, Perek 23, posuk 1)
Why was it necessary to break the 127 years into 3 sections rather than to merely say, as rendered in translation in The Living Torah Chumash by R’ Aryeh Kaplan z”l (Sefer Breish’t, Perek 23, posuk 1) :
“Sarah had lived to be 127 years old. These were the years of Sarah’s life.”