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Yahoo could not directly copy each campaign over to the new platform due to the new layout and organization structure. This is what Yahoo Help secion has said 'Your keywords were organized into ad groups by combining those that were related or similar in some way. Your ads were created by taking text from your existing titles and descriptions that was relevant to each group of keywords.'
In other words, everything was re-arranged most likely not to your liking.
The best thing to do is to go through each account one by one and re do or use the bulk upload sheet to make changes to your campaign. The template can be found in the campaigns tab, next click import and then download the template from there.