Here is the passage again:
While eating the plate of sesame chicken, Maria was thankful for her skill
with chopsticks. Eating 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.