Complex sentence: From 1985 through 1991, Koh largely devoted himself to writing and teaching, but in 1992--93, he led a group of Yale students and human rights lawyers in litigation against the United States government to free Haitian refugees interned at Guantanamo Bay, Cuba.
Split into simpler sentences: From 1985 through 1991, Koh largely devoted himself to writing and teaching. In 1992--93, he led a group of Yale students and human rights lawyers in litigation against the United States government to free Haitian refugees interned at Guantanamo Bay, Cuba.