"crown of life" is a figurative expression for God giving the person eternal life as his reward. It can be translated as "receive his reward of eternal live".
## has been promised to those who love God ##
"God has promised the crown of life to those who love him" (See: [[rc://en/ta/man/translate/figs-activepassive]])
## when he is tempted ##
"when he has the desire to do something evil"
## This temptation is from God ##
"God is trying to make me do something evil"
## God is not tempted by evil ##
"God does not desire to do evil"
## God ... does not tempt anyone ##
"God does not try to make a person do something evil"