Complex sentence: Several blocks were demolished in the mid- 80's to make way for the city within a city, but after the Savings and Loan crisis and resulting real estate crash in Dallas, plans for finishing the development fell through.
Split into simpler sentences: Several blocks were demolished in the mid- 80's to make way for the city within a city. After the Savings and Loan crisis and resulting real estate crash in Dallas, plans for finishing the development fell through.