Original: Diatoms ( Greek : ( dia ) = '' through '' + ( temnein ) = '' to cut '' , i.e. , '' cut in half '' ) are a major group of eukaryotic algae , and are one of the most common types of phytoplankton .
Simplified: Diatoms ( Greek : ( dia ) = '' through '' + ( temnein ) = '' to cut '' , i.e. , '' cut in half '' ) are a big group of eukaryotic algae .