Complex sentence: In many, but not all, social insect communities, sex is determined through haplodiploidy: haploid male drones develop from unfertilized eggs, while diploid females develop from fertilized eggs.
Split into simpler sentences: In many, but not all, social insect communities, sex is determined through haplodiploidy. Haploid male drones develop from unfertilized eggs while diploid females develop from fertilized eggs.