Complex sentence: ISOAmiga Rock Ridge specific extensions support the additional Amiga-bits for files "P" that stands for "pure" bit (indicating re-entrant command) e "S" for script bit (indicating batch file).
Split into simpler sentences: ISOAmiga Rock Ridge specific extensions support the additional Amiga-bits for files. There is support for attribute "P" that stands for "pure" bit (indicating re-entrant command) and attribute "S" for script bit (indicating batch file).