Original sentence: The Tet Offensive is widely seen, though perhaps incorrectly, as a turning point of the war in Vietnam, in which the NLF and PAVN won an enormous psychological and propaganda victory leading to the loss of popular support for the War in the United States and the eventual withdrawal of American troops
Edited sentence: The Tet Offensive is widely, however incorrectly, seen as a turning point of the war in Vietnam, in which the NLF and PAVN won an enormous psychological and propaganda victory leading to the loss of popular support for the War in the United States and the eventual withdrawal of American troops