An user English
says…

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.
Words and sentences
New
several

New
broke off

New
and

New
incorporated

New
separately

In a separate manner; not together; apart.

New
over

New
course

New
of

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