Complex sentence: The New Orleans Shell Shockers entered the PDL as an expansion franchise in 2003, playing at the soccer stadium at Tulane University in New Orleans; the name "Shell Shockers" came from the team's sponsorship by the Shell Oil Company.
Split into simpler sentences: The New Orleans Shell Shockers entered the USL Premier Development League (PDL) as an expansion franchise in 2003, playing at the soccer stadium of Tulane University. The name "Shell Shockers" came from the team's sponsorship by the Shell Oil Company.