Complex sentence: Since the passage of Proposition 1A, cost estimates for the project have risen due to increased planning and disputes over routes, and ridership projections have faced scrutiny by a number of groups including UC Berkeley's Institute of Transportation Studies.
Split into simpler sentences: Since the passage of Proposition 1A, cost estimates for the project have risen due to increased planning and disputes over routes. Ridership projections have faced scrutiny by a number of groups including UC Berkeley's Institute of Transportation Studies.