Hey Mikhail,
This is unfortunately a limitation of the CSV format itself 🙁 It’s very hard to work around! CSV means “Comma-separated values” and so issues like the ones here can arise whether you use The Events Calendar, or Microsoft Excel, or Google Sheets, or basically any software that generates CSV values…
At this time time there is not something within our plugin itself that will fix this. I’m sorry to bear that news.
In closing, I notice that you don’t seem to have any premium licenses, and are posting a technical support question in our “Pre-Sales Questions” forums. So, if you do have a premium account, log into that account to post in our premium support forums. Otherwise, for now, I will close up this thread because it is not a Pre-Sales Question. To seek technical support for our free plugins, head over to wordpress.org/plugins/the-events-calendar and use the support forums there to raise any further concerns.
Thank you!
George