Original sentence: However, the difference between them is quite significant: the Trotskyist Left Opposition is a branch of Leninism (they clearly defined themselves as the heirs of Lenin and the Old Bolsheviks who had been purged by Stalin), while Left Communism has always opposed Leninism (in fact, as discussed above, Left Communism was formed as an opposition to Leninism within the Communist movement).Left Communists entered a period of constant decline from this point onwards, although they were somewhat rejuvenated by the events of 1968
Edited sentence: Both parties still exist - the first in several (internationally present) splits after the death of Bordiga, the other in a framework called "Bureau for the International Party".However, the difference between them is quite significant: the Trotskyist Left Opposition is a branch of Leninism (they clearly defined themselves as the heirs of Lenin and the Old Bolsheviks who had been purged by Stalin), while Russian Left Communism has always opposed Leninism (in fact, as discussed above, Left Communism was formed as an opposition to "Leninism" within the Communist movement - but which is explicitely not true for the Italian Left, which was always conform with the Bolsheviks and Lenin.The main section of the Internationalist Communist Party grouped around Amadeo Bordiga and renamed later to "International Communist Party" and expanded internationally, the other section grouped around Onorato Damen.The socalled "Leninism" by the way, is an invention of the Stalinists to camouflage theoretical falsifications