Complex sentence: Born in the village of Petrivka, Kabachok was a singer in the Archbishop's choir in Poltava until 1907 when he entered the Poltava music college.
Split into simpler sentences: Born in the village of Petrivka, Kabachok was a singer in the Archbishop's choir in Poltava until 1907. In 1907 he entered the Poltava music college.