Simplify the following text for a Grade 13 native English-speaking person.
Original: These include hand stencils , dynamic figures in large head-dresses carrying spears and boomerangs , representations of Namandi spirits and mythical figures , including Alkajko , a female spirit with four arms and horn-like protuberances .
Simplified: These include hand stencils , dynamic figures in large head-dresses carrying spears and boomerangs , Namandi spirits and mythical figures , including Alkajko , a female spirit with four arms and horns .