Grammar errors DO create confusion and will detract from the message the author is trying to provide (unless the errors are intentional and are meant to contribute to the meaning of the written work in very rare cases).
Hope this helps! :)
That sentence is complete because it has both a subject and a predicate. It is also and independent clause.
Nature helped in both stories with the tree that absorbed tears and the pine tree that grew in the place of the boy that was sucked into the ground. The genres of both stories you could say are folk tale and lesson to be learned. There are metaphors and similes throughout both of the stories. You could say the tree that grew in place of the boy was a sign of the boy's former life. The tree that absorbed the girls tears took away all of her sadness.