Complex sentence: Woodbridge was established as a town, after being a municipality composed largely of either farms or industrial complexes, as an annex of sorts of Dale City, which had previously been forged as a planned community in the 1960s and 1970s.
Split into simpler sentences: Woodbridge was established as a town, after being a municipality composed largely of either farms or industrial complexes. Later, Woodbrige became the hub that formed the annex of sorts of Dale City, which had previously been forged as a planned community in the 1960s and 1970s.