Complex sentence: But over the years he was mostly known as 石修 (Bill Chan/Shek Sau) 's son and hes hasn't been acting much afetr Hearts of Fencing, until he appeared in My Family as the youngest son in 2005.
Split into simpler sentences: But over the years he was mostly known as 石修 (Bill Chan/Shek Sau) 's son. He has not been actively acting after Hearts of Fencing, until he appeared in My Family as the youngest son in 2005.