Complex sentence: In 2003, the city of San Mateo, gave funding to Hillsdale, to put in Smaller Learning Communities (SLC's), which gives students and teachers smaller class sizes, so individual students can be given more attention.
Split into simpler sentences: In 2003, the city of San Mateo approved funding for Hillsdale to put in Smaller Learning Communities (SLC's). This program establishes smaller class sizes, so individual students can be given more attention.