Complex sentence: The 5-door hatchbacks were built in Hermosillo, Mexico, and the 3-door hatchbacks were assembled (along with the Mazda 323) were built in Hiroshima, Japan.
Split into simpler sentences: The 5-door hatchbacks were built in Hermosillo, Mexico. The 3-door hatchbacks were assembled (along with the Mazda 323) and were built in Hiroshima, Japan.