Have been made (εισιν γεγονοτες). Periphrastic perfect active indicative of γινομα (perfect active participle of γινομα) and then εισιν. The parenthesis runs from ο μεν γαρ (for they) to εις τον αιωνα (for ever, end of verse Hebrews 7:21).

But he with an oath (ο δε μετα ορκωμοσιας). Positive statement in place of the negative one in verse Hebrews 7:20.