Complex sentence: When studying CBs, it is can be combined with GFP (Green Florescent Protein) to form Colin-GFP hybrid protein, which can be used to locate CBs underneath a microscope, usually near the nucleolus of the cell.
Split into simpler sentences: When studying CBs, it is can be combined with GFP (Green Florescent Protein) to form Colin-GFP hybrid protein. Then the hybrid protein can be used to locate CBs underneath a microscope, usually near the nucleolus of the cell.