Complex sentence: At the age of 10, he switched over to the 21-stringed chitravina and gave his maiden chitravina concert at age 11 and established himself as a frontline Indian string instrumentalist within the next 3 years.
Split into simpler sentences: At the age of 10, he switched over to the 21-stringed chitravina and gave his maiden chitravina concert at age 11. He established himself as a frontline Indian string instrumentalist within the next 3 years.