Complex sentence: On November 19th, Seventeen announced that they will hold their first ever solo Christmas concert'2015 LIKE SEVENTEEN-Boys Wish' from the 24th until the 26th of December at the Yongsan Art Hall, Theatre Mir.
Split into simpler sentences: On November 19th, Seventeen announced their first ever solo Christmas concert'2015 LIKE SEVENTEEN-Boys Wish'. This concert would be held on three different days from the 24th to the 26th of December at the Yongsan Art Hall, Theatre Mir.