Here is the passage again:
While eating the plate of sesame chicken, Maria was thankful for her skill
with chopsticks. Utensils that required only one hand
to use. For Maria's left hand was pinned to the booth by Hunter,
her five-year-old son who lay sleeping after a long day of shopping at the
mall.
The second part is an appositive fragment. All you have here is a noun phrase renaming chopsticks.