Complex sentence: Realuyo began his writing through his plays and poetry in elementary school in Manila, where he wrote in his native language Pilipino (Tagalog), but later shifted to English when his family immigrated to the United States when he was a teenager.
Split into simpler sentences: Realuyo began his writing through his plays and poetry in elementary school. He wrote in Pilipino/Tagalog, his native language but later shifted to English when his family immigrated to the United States when he was a teenager.