The Gantt control is designed to display one task per row.
1. There is an option to display different task "versions" for the same row. However, they are read-only and they will stacked vertically inside the row (increasing the row height). In the MVC version this will be possible in the upcoming 8.1 release. You can take a look at this feature in the JavaScript demo:
http://javascript.daypilot.org/demo/gantt/taskversions.html
2. If you need to have multiple full-features events/reservations for each resource you might want to use the Scheduler control instead of the Gantt chart control:
http://mvc.daypilot.org/demo/scheduler/