Complex sentence: With Rothstein's death in 1928 Gordon's position began to decline and made an alliance with future National Crime Syndicate founders Charles Luciano, Louis Buchalter, and Meyer Lansky.
Split into simpler sentences: With Rothstein's death in 1928 Gordon's position began to decline. He made an alliance with future National Crime Syndicate founders Charles Luciano, Louis Buchalter, and Meyer Lansky.