How does Nick characterize Tom and Daisy at the end of the book? What has each of them “smashed” during the course of the novel? please help! (:

This line says it all:

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they were careless people, Tom and Daisy—they
smashed up things and creatures and then retreated back into their money or their vast
carelessness, or whatever it was that kept them together, and let other people clean up
the mess they had made. . .
.

Tom and Daisy are the type
of people Nick does not want to become. They are only concerned with money and
appearances. Whenever they destroy something, they buy their way out of it. It does not
matter to them who gets hurt in the process.

What they have
smashed:

Tom is partially responsible for Myrtle's death
and Wilson's suicide; he is directly responsible for Gatsby's murder. Tom leads Myrtle
on and this is the path to her destruction.

Daisy is
responsible for Myrtle's death and, in a way, for Gatsby's as well. Daisy leads Gatsby
in in just the same way Tom does Myrtle.