Complex sentence: He attended Robinson Elementary School where at the age of 8 he started to participate in the school's activities as a singer and in his first school play when he was 10 years old he sang the song "Old Black Joe", which became his favorite.
Split into simpler sentences: He attended Robinson Elementary School where at the age of 8 he started to participate in the school's activities as a singer. In his first school play when he was 10 years old he sang the song "Old Black Joe", which became his favorite.