Here's the breakdown:
* As well as is used to introduce an additional element or idea.
* If it's followed by a noun or noun phrase, no comma is needed:
* "He enjoys swimming as well as running."
* "The hotel offers a pool as well as a spa."
* If it's followed by a clause (a subject and verb) or a phrase with a verb, a comma is needed:
* "He enjoys swimming, as well as running marathons."
* "She loves to cook, as well as read books."
Example:
* "She is a talented artist, as well as a skilled musician." (Comma needed because "a skilled musician" is a phrase with a verb implied)
Remember: Clarity is key. If you're unsure about whether a comma is needed, it's always better to err on the side of caution and use one.