Complex sentence: The mRNA of FGF-2 has multiple translational start sites and depending on which where the translation begins, the protein products that results will have different localization regions, molecular weight and ultimately function in different pathways.
Split into simpler sentences: The mRNA of FGF-2 has multiple translational start sites. Depending on which where the translation begins, the protein products that result will have different localization regions, molecular weight, and will ultimately function in different pathways.