It will actually be God who condemns Jesus' generation. AT: "God will listen to the citizens of Nineveh and condemn this generation" (See: [[rc://en/ta/man/translate/figs-explicit]])
# and see
"and look." This emphasizes what Jesus says next.
# someone greater
"someone more important"
# someone
Jesus is speaking about himself. (See: [[rc://en/ta/man/translate/figs-123person]])
You can make explicit the implicit meaning of Jesus' statement. AT: "than Jonah is here, yet you still have not repented, which is why God will condemn you" (See: [[rc://en/ta/man/translate/figs-explicit]])