Complex sentence: Another major development in season four brought Grace's first child from a man she never wed, son Matthew Tom Everett Scott, showing up on her doorstep wishing to know if Grace had been responsible for his screwed-up life.
Split into simpler sentences: Another major development in season four brought Grace's first child from a man she never wed, son Matthew (Tom Everett Scott). He showed up on her doorstep wishing to know if Grace had been responsible for his screwed-up life.