Complex sentence: Beginning with piano at age three, she started the guitar at about 8--9 years, referring to the repertoire of Simon & Garfunkel in particular, her parents offered her the first guitar at the end of her primary schooling.
Split into simpler sentences: Beginning with piano at age three, she started playing guitar at about 8 or 9 years of age, referring to the repertoire of Simon & Garfunkel in particular. Her parents gave her her first guitar at the end of her primary schooling.