Complex sentence: In July 2010, UC-HiPACC's first summer school, held on the campus of UC Santa Cruz, focused on the topic of Hydrodynamic Galaxy Simulations.
Split into simpler sentences: In July 2010, UC-HiPACC's first summer school, focused on the topic of Galaxy Simulations, was held on the campus of UCSC. The 2010 school was at UCSC, on the topic of Hydrodynamic Galaxy Simulations.