Here is the original item:
Coated with dust,
(A) the blinds
filtered the sunlight entering Adrian's cluttered
apartment,
(B) where
clothing and empty take-out boxes littered the
floor. (C)
As flies buzzed around rotting bananas on the kitchen counter.
You wanted to do this:
Coated with dust the blinds filtered the sunlight
entering Adrian's cluttered apartment,
where clothing and empty take-out boxes littered the floor. As flies buzzed
around rotting bananas on the kitchen counter.
Removing the comma after dust is an error. Coated with dust is a participle phrase. You need that comma to connect the phrase to the main clause that follows.
You might want to review the rules.