Complex sentence: George M. Cohan's song "Forty-five Minutes from Broadway" is about New Rochelle, and the average 36 minute train ride plus about a ten minute walk from Grand Central to Broadway means the station is still about forty-five minutes away.
Split into simpler sentences: George M. Cohan's song "Forty-five Minutes from Broadway" is about New Rochelle. The average 36 minute train ride and 10 minute walk from Grand Central to Broadway places the station about forty-five minutes away.