Complex sentence: The hammer-shaped head is wide, measuring 28-32% of the body length, but broad lengthwise, with a broadly arched front margin, an indentation in the middle, and two more on the sides.
Split into simpler sentences: The hammer-shaped head is wide, measuring 28-32% of the body length, but broad lengthwise. The front margin is broadly arched, with an indentation in the middle, and two more on the sides.