Complex sentence: On 23 December 2015 the Sejm passed a law, which reorganized the Constitutional Court, introducing a requirement for a two-thirds majority and the mandatory participation of at least 13, instead of 9 of the 15 judges.
Split into simpler sentences: On 23 December 2015 the Sejm passed a law, which re-organized the Constitutional Court. The amendment introduced a two-third majority and the mandatory participation of at least 13, instead of 9, of the 15 judges.