Original sentence: "  Despite his unique method of instruction, many of his students developed good technique but unfortunantly also devoloped an inadequate tone quality.He gave many lectures throughout his life, but never wrote a book or article on his unconventional approach to trumpet
Edited sentence: " Despite his unique method of instruction, many of his students developed good technique but unfortunantly also devoloped an inadequate tone quality.He gave many lectures throughout his life, but never wrote a book or article on his controversial approach to trumpet