※ 引述《enggys (SamTEFL)》之铭言：
: 简化为 "as follows"、"as it regards" 简化为 "as regards" 大家应该也看过。
"as it had been scheduled" 可以被简化为 "as had been scheduled"
"as it follows" 简化为 "as follows"、"as it regards" 简化为 "as regards"
以上你说的3个简化，我全没看过。
"As had been scheduled" is a reasonable paraphrase, and in American English
"as was scheduled" (but not "as it was scheduled") would also be reasonable.
But in the original sentence "scheduled" is functioning normally as an
adjective and there's no need to see it as a truncation of a longer phrase.
https://pse.is/9aqyzu