Not that I am aware of. Cron uses the Cron Table for time specific invocation of the job only and can't rely on the type of "if" logic you are suggesting. It really depends on what you are doing but an alternative would be to combine the jobs you want performed into some sort of executable script on your system e.g. Perform task a; check to see if task a is complete; when task a completes perform task b. Then use cron to invoke the script.
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