Complex sentence: He moved to Tokyo when he was 19 years old and entered the "dōjō" of Shingoro Negishi of the Shindō Munen-ryū.
Split into simpler sentences: He moved to Tokyo when he was about 19 years old. In Tokyo, he entered the "dōjō" of Shingoro Negishi of the Shindō Munen-ryū.