From "Literary Devices" (literarydevices.net)
A simple sentence in grammar has only one main or independent clause and no dependent or subordinate clauses. Comprising a subject and a predicate, this short and independent syntactic entity intends to convey a complete idea or meanings of an idea.
Example #2: The Awakening (by Kate Chopin)
“She was becoming herself and daily casting aside that fictitious self which we assume like a garment with which to appear before the world.”
This is another excellent example of a simple sentence without the use of commas. It is just a single sentence without dependent clauses.
The question: Does the above example sentence not include a dependent clause?
If no, what is "which we assume like a garment with which to appear before the world" in the sentence?