The obligatory video is of course "Four Chords" by Axis of Awesome: https://www.youtube.com/watch?v=5pidokakU4I Rick Beato has kind of the opposite video about "the most complex song ever": https://www.youtube.com/watch?v=ZnRxTW8GxT8 The song in question is Never Gonna Let You Go by Sergio Mendes; plenty of videos exist of it; here's one live: https://www.youtube.com/watch?v=fOPh3bTglak
Rick Beat is trying to deceive you. If you really believe that this Sergio Mendes song is complicated, you need to listen to some older pop songs. For example, Stevie Wonder is a good composer to start.
I think the trick is that it’s bossa nova, which tends to have a lot of those semitone shifts that Rick highlights. The Girl from Ipanema is the classic example.
I love that they seem so complex when you look at the individual chord movements, and yet the melody flows very naturally (to my ears, anyway!)
The effect in Never Gonna Let You Go feels a bit like the dramatic key change you often get right at the end of those 80s ballads, but smoothly integrated throughout the whole song. I can well imagine some hate that, but I love it!