Complex sentence: Midhun started his martial arts career at the age of 8 with his younger brother Nithinjith (also a former National Karate Champion) he trained in Shito-ryu Karate, and started to learn Taekwondo and Judo under SHIHAN Gireesh PK from an early age.
Split into simpler sentences: Midhun started his martial arts career at 8 years old, with his younger brother Nithinjith (now also a former National Karate Champion). He trained in Shito-ryu Karate, and began to learn Taekwondo and Judo under SHIHAN Gireesh PK from an early age.