I can see both ways of these verbs being simplex and complex. As evidence for these verbs being complex, there are words that have the morpheme “for” which in these examples means “away” or “against” or “without”. So forbid, forget, forgive, forgo, and foreseer seem to be systematically related in some way as they all follow a similar pattern in meaning. However, “for” in the beginning of all words does not always mean this; for example, in “forward,” “fort,” and “foreign,” are all simplex because they cannot be broken up into constituents. However, I think that this specific group of given verbs would be complex, because “for” and the other half of the words are morphemes that have their own meaning. As an example: “forgo” can be broken down into “for” and “go.” When adding “for” as a prefix to “go,” it means “to go without.” Similarly, “forswear” can be broken down into “for” and “swear,” and together they mean to swear against, or wrongly. 

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