Complex sentence: He made his senior debut for Leinster on the 6 September 1996 in a friendly match away to a Genoa President's XV and his senior Irish debut on 1 February 1997 against Wales.
Split into simpler sentences: He made his senior debut for Leinster on the 6 September 1996 in a friendly match away to a Genoa President's XV. Denis made his senior Irish debut on 1 February 1997 against Wales.