How to differentiate long paraphrasing and original ideas with APA in-text citations?

Let's say I have the following paragraph:

Smith (2011) contends that blah blah blah. Blah blah blah blah blah blah blah. blah blah blah blah blah blah blah blah. This allows for one to decide that monkeys are actually fish.

Everything in blahs is paraphrased from Smith (2011), but the conclusion that monkeys are actually fish is my own idea. How do I mark where Smith's ideas end and my ideas start?