Complex sentence: Among Filipino swords, the most distinguishing characterstic of the Kampilan is its size, at about 36 to 40 inches (90 to 100 cm) long, it is much larger than other Filipino swords.
Split into simpler sentences: Among Filipino swords, the most distinguishing characterstic of the Kampilan is its huge size. At about 36 to 40 inches (90 to 100 cm) long, it is much larger than other Filipino swords.