Complex sentence: The two planes 15 and 16 (planes F and 10 in hexadecimal), called Supplementary Private Use Area-A and-B are available for character assignment by parties outside the ISO and the Unicode Consortium.
Split into simpler sentences: The two planes 15 and 16 (planes F and 10 in hexadecimal), are designated as "private use planes". They contain blocks called Supplementary Private Use Area-A and-B which are available for character assignment by parties outside the ISO and the Unicode Consortium.