Back in the "olden days" when people knew how to diagram sentences, there was a way to diagram the one suggested. In it, the pronoun appears where the subject of the sentence always goes, then the line branches into upper and lower tiers. The top one includes the words "catch on quite quickly" and the bottom one includes the words "(am) not dumb either" and there is a little dotted line which connects the upper and the lower on which the word "and" is written.

Does anybody remember diagramming sentences? Or am I revealing myself as the prehistoric man?

PS: Welcome, Timo. Don't be a stranger.