Complex sentence: Upon Buchalter's release, he teamed with his childhood friend, Jacob "Gurrah" Shapiro; through force and fear they began gaining control of the garment industry unions on the Lower East Side.
Split into simpler sentences: Upon Buchalter's release, he teamed with his childhood friend, Jacob "Gurrah" Shapiro. Through force and fear, they began gaining control of the garment industry unions on the Lower East Side.