source: The original plan for the bridge was to use concrete to keep costs down, but a steel design was chosen after the bids for a concrete bridge came in too high.
target: The original plan for the bridge was to use concrete. It was to to keep costs down. But a steel design was chosen after the bids. A concrete bridge came in too high.
references: The original plan for the bridge was to use concrete. It was to to keep costs down. But a steel design was chosen after the bids. A concrete bridge came in too high.