Complex sentence: In the original plans Leusden would grow to around 46,000 inhabitants, but after the initial expansion phases, there was growing resistance from the population, and some of the later phases of the expansion have been abandoned.
Split into simpler sentences: In the original plans Leusden would grow to around 46,000 inhabitants, but after the initial expansion phases there was growing resistance from the population. So some of the later phases of the expansion have been abandoned.