An user English
says…

All
Determiner
  prime
Adjective
  and
Coordinating conjunction
  second
2nd
Adjective
  majors
Noun
  became
Verb
  known
Verb
  as
Adposition
  majors
Noun
.

All prime and second majors became known as majors.
Words and sentences
New
all

New
and

2nd
New
second

New
became

  1. simple past of become
  2. (colloquial) past participle of become

New
known

New
as

New
majors

plural of major

New
prime

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