Several

Adjective

  towns

Noun

  broke off

  and

Coordinating conjunction

  incorporated

Verb

  separately

Adverb

  over

Adposition

  the

Determiner

  course

Noun

  of

Adposition

  time

⌚

Noun

.

Several towns broke off and incorporated separately over the course of time.

Several towns broke off and incorporated separately over the course of time.