I'm roughly the same age as EJ53, so our respective Saturn returns were at around the same time, but in different signs & houses.
My natal Saturn is in my 8th and in Leo. Saturn rules my Asc, and Leo is my sun sign, so Saturn is a significant planet in my whole chart, and transiting Saturn brings powerful forces into play throughout my chart. Natal Saturn trines my natal Jupiter in the 11th, so a significant transit to natal Saturn always forces me to look hard at my long-term goals.
The first Saturn Return at 29 pushed me to look more closely at my family/partnership situation. Pretty much all I decided at the time was that the situation I was in was untenable, but I was not at that stage ready to change it. I changed it at the next Saturn square 7 years later.
My 2nd Saturn Return was quite strange. It coincided with the birth of my first grandchild - this was an unexpected (and unplanned) event. I also became a bit obsessed with thoughts of death and dying (not in a dreading way, as I am not afraid of dying) and who would pay for my funeral. I then realised that with another generation now begun, I had to look more at a rebirth of myself in this lifetime than the death of the body. It was a very 8th house experience, and a bit unsettling at the time it was occurring.
On the surface, I can't see how my two Saturn returns were related, but I think that is because at the first one I was married with young children, and at the time of the 2nd I was single and with grown children, and no real ties. Both were valuable and necessary as transits, but I have quite a lot of fixed energy in my chart, so I resist change - always - before letting go to what is trying to find its way to me.
PS: In retrospect, both Saturn returns involved coming face-to-face with the principle of the Controlling Father.............Saturn in the 8th
My first Saturn Return was held up by my fear of how my father would react were I to leave my marriage. He was a conservative Christian, and used it to control his family members.
My 2nd Saturn Return brought me face-to-face with a different kind of controlling father, but a far more overtly destructive one in the guise of the father of my grandchild's mother, a man who wants respect, but does not know how to get it.