I am sorry for this delayed reply to your gardening question. We are transitioning to a new Q&A system and your question was unfortunately lost in the transition. I have discovered it now and hope this reply is not too late to be of help.
Don't discard the plant yet. Tomatoes have trouble setting fruit in our summer heat. The plant will likely start to set fruit again in another couple of months when temps start to cool off a bit.
The splitting is due to a rain or watering after a period of dry conditions.
Thanks for the question. Please stop in again soon!
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