Complex sentence: Bach was born in Eisenach, Saxe-Eisenach, into a great musical family; his father, Johann Ambrosius Bach, was the director of the town musicians, and all of his uncles were professional musicians.
Split into simpler sentences: Bach was born in Eisenach, Saxe-Eisenach, into a great musical family. His father, Johann Ambrosius Bach, was the director of the town musicians, and all of his uncles were professional musicians.