Complex sentence: Griffiths was raised in Dolwyddelan, North Wales He set up his own theatre company aged 13 years old called Cwmni Ieuenctid Dolwyddelan.
Split into simpler sentences: Griffiths was raised in Dolwyddelan, North Wales. At the age of thirteen, he set up his own theatre company, called Cwmni Ieuenctid Dolwyddelan.