This can be restated to remove the abstract nouns "severity" and "kindness." Alternate translation: "God dealt harshly with the Jews who fell ... but God acts kindly toward you" (See: [[rc://en/ta/man/translate/figs-abstractnouns]])
Doing what is wrong is spoken of as if it is falling down. Alternate translation: "the Jews who have done wrong" or "the Jews who have refused to trust in Christ" (See: [[rc://en/ta/man/translate/figs-metaphor]])
This can be restated to remove the abstract noun "kindness." Alternate translation: "if you continue doing what is right so that he continues being kind to you" (See: [[rc://en/ta/man/translate/figs-abstractnouns]])
Paul again uses the metaphor of a branch, which God can "cut off" if he needs to. Here "cut off" is a metaphor for rejecting someone. You can translate this in an active form. Alternate translation: "Otherwise God will cut you off" or "Otherwise God will reject you" (See: [[rc://en/ta/man/translate/figs-metaphor]] and [[rc://en/ta/man/translate/figs-activepassive]])