The phrase "paid attention to" implies helping or judging someone. Here it refers to Yahweh helping Sarah have a baby. This can be translated as "Yahweh helped Sarah."
## bore a son to Abraham ##
"gave birth to Abraham's son"
## in his old age ##
"when Abraham was very old"
## at the set time of which God had spoken to him ##
"at the exact time that God had told him it would happen"
## Abraham named his son, the one who had been born to him, whom Sarah bore to him, Isaac. ##
“Abraham named his newborn son, the one Sarah gave birth to, Isaac” or "Abraham named their newborn son Isaac."
## Abraham circumcised his son Isaac when he was eight days old ##
"When his son Isaac was eight days old, Abraham circumcised him"
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