Complex sentence: He began studying arnis with his grandfather Leon Presas and uncle by the age of six, and by the time he was fourteen he was traveling to learn from other instructors and to compete in stick-fighting competitions.
Split into simpler sentences: He began studying arnis with his grandfather, Leon Presas, and uncle at the age of six. By the age of fourteen, he was traveling to learn from other instructors and to compete in stick-fighting competitions.