Complex sentence: Starch granules are usually under 100 microns in size, and are, therefore, best observed under compound microscopes equipped with various lighting conditions and magnifications from x200 to x800.
Split into simpler sentences: Starch granules are usually under 100 microns in size. Due to their small size, they are best observed under compound microscopes equipped with various lighting conditions and magnifications from x200 to x800.