Complex sentence: In its early days, Block E was part of an early suburb of mansions and the Jefferson School, one of Minneapolis's early elementary schools, was located at First Avenue North and Seventh Street, across from the present day music club First Avenue.
Split into simpler sentences: In its early days, Block E was part of an early suburb of mansions and the Jefferson School. The Jefferson School, one of Minneapolis's early elementary schools, was located at First Avenue North and Seventh Street, across from the present day music club First Avenue.