Have you actually listen to nowadays comedians ? It _is_ one joke/sentence nowadays (at least in my country).
More exactly, they separate each sentence. Each has a tiny bit of funny in it (in the words, in the way they say it, because they stay in character, whatever) and they let audience lol. Rinse and repeat.
Look I just googled "up and coming standupers" and picked the first video (new laptop, not connected to Gaccount) https://www.youtube.com/watch?v=s6uW1odtjPc
Check the 36 first seconds.
Humour changed without you (us) realizing ¯\_(ツ)_/¯