Complex sentence: He used to spend most of his time reciting the Holy Qur'an, and continued to learn the Quranic verses as they were recited by Prophet Muhammad SAW.Hazrat Zayd R.A later volunteered to fight when he was 19 years old.
Split into simpler sentences: He used to spend most of his time reciting the Qur'an, and continued to learn the Quranic verses as they were recited by Muhammad. Zayd later volunteered to fight when he was 19 years old.