Complex sentence: Piet Kruijff, head of the local resistance, had been organising the evaders into safe houses in Ede, but soon with over 80 men in the town it was becoming too congested and so he began housing men in Reemst as well.
Split into simpler sentences: Piet Kruijff, head of the local Resistance, had been organising the evaders into safe houses in Ede. Soon there were over 80 men in the town and it was becoming so too congested that he began housing men in Reemst as well.