It is an understood principle in the Vedic tradition that the words of the spiritual master should not be changed in any way. The guru is not an ordinary man subjected to the four defects of human frailty therefore whatever he writes is perfect. Being in direct connection with Krsna, his words are dictated by the Lord Himself.
Srila Prabhupada in his manifested lila engaged some of his early disciples in the service of editing his manuscripts and transcripts of his dictation tapes. They were to correct the technicalities of the language for clarity and never change any of the intended meanings in his books. Being initiated and therefore somehow already familiar with the philosophy of Krsna consciousness by following Srila Prabhupada, they would try to understand the meaning from his rough manuscripts or dictations and then present the same meaning in a polished and grammatically correct English. That’s all. Since these early editors could understand Srila Prabhupada’s words in order to do their editing, in no way should Srila Prabhupada’s original words be considered incomplete or incomprehensible. As the early editors could understand, certainly new devotees can also understand, especially now when the full body of Srila Prabhupada’s vani is freely available with lectures, conversations, other books can be also consulted.