Complex sentence: In the meantime, fibroblasts from the connective tissue migrate across the amputation surface to meet at the center of the wound.They multiply to form a blastema which are the progenitors for the new limb.
Split into simpler sentences: In the meantime, fibroblasts from the connective tissue migrate across the amputation surface to meet at the center of the wound. These fibroblasts multiply to form a blastema, which are the progenitors for the new limb.