Simplify the following text for a Grade 14 native English-speaking person.
Original: Radiolarians ( also radiolaria ) are amoeboid protozoa that produce intricate mineral skeletons , typically with a central capsule dividing the cell into inner and outer portions , called endoplasm and ectoplasm .
Simplified: Radiolarians ( Radiolaria ) are amoeboid protists which produce intricate mineral skeletons .