# if a man's brother dies, having a wife, and being childless

"if a man's brother dies when he has a wife but does not have children" or "if a man's brother has a wife and no children and that brother dies"

# the man should take the brother's wife

"the man should marry his dead brother's widow"

# and raise up children for his brother

"and have children for his brother" or "and produce children for his brother"