Here the 1849 LDS edition accidentally omitted the plural pronoun they, with the result that the passage ends up stating that Com fought for the space of many years, which is true enough. But the original text states that Com and Amgid fought (against each other) for many years. The 1920 LDS edition restored the original they in this passage, undoubtedly by reference to one of the early editions of the Book of Mormon. Similarly, the critical text will maintain the plural subject pronoun here.
Summary: Maintain in Ether 10:32 the plural subject pronoun they, the reading of the earliest text (“and they fought for the space of many years”); the 1849 omission of the they changed the subject to he (that is, Com); although that reading will work, the plural reading is the correct one.