Complex sentence: Dave Walsh (born June 23,1984, grew up in Grandville, Michigan) has been a professional gamer since March 2003, originally under the pseudonym Hotshy, then later adopting the name Walshy.
Split into simpler sentences: Dave Walsh (born June 23,1984) grew up in Grandville, Michigan. Walsh has been a professional gamer since March 2003, originally under the pseudonym Hotshy, then later adopting the name Walshy.