Here is the original item:
Anyone who visits Neil will find uneaten fruit all over his
apartment. (A)
Such as rotting bananas on the kitchen
counter,
(B) desiccated
grapes in a bowl on the coffee table,
(C) and a
drippy apple on the bureau by the bed.
You wanted to do this:
Anyone who visits Neil will find uneaten fruit all over his apartment. Such
as rotting bananas on the kitchen counter. Desiccated
grapes in a bowl on the coffee table, and
a drippy apple on the bureau by the bed.
Adding a period after counter creates a fragment. You need to reconsider your choices.
You might want to review the rules.