Complex sentence: As other locations were voted down, Springfield was selected by a 46--37 vote on February 28,1837 and reconsideration efforts were defeated, under Lincoln's leadership, in the 1838--1839 sessions.
Split into simpler sentences: As other locations were voted down, Springfield was selected by a 46 to 37 vote margin on February 28,1837. Under Lincoln's leadership, reconsideration efforts were defeated in the 1838--1839 sessions.