Student or Learner
I know the rule that infinitive phrase modify a noun from the behind.
But it seems that sometimes they modify a noun from the front as stated below, using hyphens.
1. a high-level group soon to be appointed
2. a soon-to-be-appointed high-level group
When do we use 2. ?
What is the difference between 1. and 2. ?
Thank you in advance.