Complex sentence: A rumor stated that Tandy would offer Unix for the computer; in early 1983 the company indeed switched to Xenix, and offered it for free to existing customers; by mid- 1983 an estimated 5,000 of 30,000 Model 16s ran Xenix.
Split into simpler sentences: A rumor stated that Tandy would offer Unix for the computer. In early 1983 the company indeed switched to Xenix, and offered it for free to existing customers; by mid- 1983 an estimated 5,000 of 30,000 Model 16s ran Xenix.