Complex sentence: After its founding SSOC came to be formally tied to the SDS as a fraternal organization with a regional mandate in the South, and joint SDS-SSOC chapters existed some schools like the University of North Carolina.
Split into simpler sentences: After its founding SSOC came to be formally tied to the SDS as a fraternal organization with a regional mandate in the South. Joint SDS-SSOC chapters existed some schools like the University of North Carolina.