Complex sentence: It was known that during this reign, Muhammad Amin was closely monitored by Ivan III.When Muhammad Amin corresponded with Crimean Khanate, all correspondence was sent through Moscow, translated into Russian for Ivan III to read.
Split into simpler sentences: It was known that during this reign Moxammat Amin was closely monitored by Ivan III. Moxammat Amin corresponded with Crimean Khanate. All correspondence was sent through Moscow, translated into Russian for Ivan III to read.