Complex sentence: Certain school rules pertain specifically to certain age groups, for instance, no one else may ride a San child's bicycle, and only Shack and Carriage children are allowed to build camp fires.
Split into simpler sentences: Certain school rules pertain specifically to certain age groups. For instance, no one else may ride a "San" child's bicycle, and only "Shack" and "Carriage" children are allowed to build camp fires.