Lol there is nothing complex about CBH. I've stated a few times already ITT that this song is about as simple/complex as furlined.
The synth bass line is the same in the verses and chorus and outro. The guitar just come in over it in the chorus. This works for a song like me I'm not but not this or fur lined.
the beat doesn't change except for some hi hat work in the chorus. It's just a hella lazy song.