Complex sentence: Originally formed in early 2005 as the Space City Rollergirls, Houston Roller Derby split from their founding group in the pursuit of an all-skater owned league, after the founding members of Space City attempted to fire the league's coed training team.
Split into simpler sentences: Originally formed in early 2005 as the Space City Rollergirls, Houston Roller Derby split from their founding group in the pursuit of an all-skater owned league. A majority of the skaters involved in Space City Rollergirls formed HRD after the founding members of Space City Rollergirls attempted to fire the league's coed training team.