Complex sentence: The 7 Subway Extension would expand in scope, with the IRT Flushing Line being extended to 14th Street and Eighth Avenue, and the Utica and Nostrand Avenue Lines in Brooklyn would both be realized.
Split into simpler sentences: The 7 Subway Extension would expand in scope, with the IRT Flushing Line being extended to 14th Street and Eighth Avenue. Both the Utica and Nostrand Avenue Lines in Brooklyn would be realized.