Complex sentence: Hrachia was just under seven years old when his father took him to the Armenian School, where he revealed his linguistic ability: the boy studied Armenian, French, and Turkish, and in just two years he completed his studies.
Split into simpler sentences: Hrachia was just under seven years old when his father took him to the Armenian School, where he revealed his linguistic ability. While there, he studied Armenian, French, and Turkish, and in just two years he completed his studies.