Answer is :
It creates a compound-complex sentence. It adds detail about the speaker’s personality
adding details about the speaker’s personality
The underlined clause add variety and meaning to the sentence in that the sentence is constructed in the form of a compound complex sentence. In a complex sentence you have a independent sentence, plus a dependent. Furthermore adding the complex sentence to the compound sentence creates COMPOUND-COMPLEX SENTENCE where it has independent clauses joined to one or more dependent clauses.
Dependent sentence: - my mind seems to process ideas faster
Independent: On days when I go jogging in the morning
On the other hand the sentence: ... my mood is more positive. is adding details about the speaker’s personality. we can safely assume that under normal circumstances the mood of the person , the subject would be different (less positive)-.
