# so that his heart is not lifted up above his brothers

"so that he does not think he is better than his fellow Israelites" 

# so that he does not turn away from the commandments, to the right hand or to the left

"so that he does not disobey any of the commandments" or "so that he obeys all of the commandments"

# prolong his days

"be able to live a long time". See Deuteronomy 4:26.