I like Karen's answer. Your sentences will sound much better if you can reword them so that you don't need two prepositions.
In some cases, it isn't really necessary to use a preposition for each word. For example, in the sentence "Thank you for the criticisms OF and suggestions FOR the first draft of my book," you could think of the grammar this way:
"Thank you for the criticisms
[thank you for] the suggestions for the first draft of my book."
You don't need "of," because "thank you for the criticisms" is a complete clause by itself. You don't have to connect it to "of my book." In cases where this won't work (I don't think it works for your first example, for instance), try to change the wording, as Karen says.