# and if he did not spare the ancient world
"and if God did not refrain from punishing the people who lived in the ancient world"
# but preserved Noah ... along with seven others
"but protected Noah ... along with seven others."
# Noah, a herald of righteousness
"Noah, a preacher of righteousness." Possible meanings are 1) Noah taught people that they should live righteous lives, or 2) Noah warned people that the righteous God would judge them.