Here is a learning support on using colons and semicolons in compound sentences. Like a number of these published on this blog recently, this is from Paul Brians’ fine book Common Errors in English Usage.
This passage is a little more than half of the page. There is plenty of room to add supported examples, structured exercises, or whatever else best suits the needs of your classroom. It’s formatted in Microsoft Word, so it is easily exportable and manipulable.
If you find typos in this document, I would appreciate a notification. And, as always, if you find this material useful in your practice, I would be grateful to hear what you think of it. I seek your peer review.