Complex sentence: This snake grows to a maximum length of 166 cm (5.5 ft) and averages about 120 cm (4 ft) on mainland Asian populations, although island populations do not attain this size.
Split into simpler sentences: This snake grows to a maximum length of 166 cm (5.5 ft). The average length is about 120 cm (4 ft) on the mainland, although island populations do not attain this size.