Complex sentence: In fall 2009, CTA released the results of its Alternatives Analysis Screen 3, in which CTA decided to begin early engineering work on Phase 2, due to its simple alignment through unpopulated areas and its relatively low cost (estimated at $1.1 billion).
Split into simpler sentences: In fall 2009, CTA released the results of its Alternatives Analysis Screen 3. In it, CTA made the decision to begin early engineering work on Phase 2, due to its simple alignment through unpopulated areas and its relatively low cost (estimated at $1.1 billion).