Complex sentence: Where this two-tier system exists, the county councils are responsible for running some local services, such as education, social services and roads, whilst district councils run other services, such as waste collection, local planning and council housing.
Split into simpler sentences: Where this two-tier system exists, the county councils are responsible for running some local services, such as education, social services, and roads. District councils run other services, such as waste collection, local planning, and council housing.