Complex sentence: The damaged tissues take about 10 days to heal and the arm takes about 10 months to regenerate a new disk and arms 0.5 inch (1 cm) in length.
Split into simpler sentences: The damaged tissues take about 10 days to heal and the animal grows a new arm over the course of several months. It takes about 10 months to regenerate a new disk with arms 0.5 inch (1 cm) in length.