involved = complex, many things happened.
This phrase is often used as, "a long, involved process"
"Learning English is a long, involved process."
"Growing crystals is a long, involved process."
So, one of those dreams where you start off on the moon, competing in a cheeseburger eating completion with your old postman, then a half bird / half walrus climbs out of the ground and starts talking like a basketball coach and you realize you have to get back to Earth to... etc.
Student or Learner