Complex sentence: Shemini Atzeret (שמיני עצרת- "the Eighth (day) of Assembly"; Ashkenazic pron. "shmini-atseres") is a Jewish holiday celebrated on the 22nd day of the Hebrew month of Tishrei.
Split into simpler sentences: Shemini Atzeret (שמיני עצרת- "the Eighth (day) of Assembly"; Ashkenazic pron. "shmini-atseres") is a Jewish holiday. It is celebrated on the 22nd day of the Hebrew month of Tishrei.