Complex sentence: Jay Westerdal (born 1978) is a domainer, entrepreneur and VC investor best known for his work creating DomainTools.com, a web service that looks up historical ownership of a website.
Split into simpler sentences: Jay Westerdal (born 1978) is a domainer, entrepreneur and VC investor best known for his work creating DomainTools.com. DomainTools is a service that looks up historical ownership of a website.