Thank you for your interest in TeamPulse.
At this point one possible solution for your case is to just move the item from sprint 1 to sprint 2.
Other possible solution is to create manually a new story, create a relationship between the two stories, move not done tasks to the new story. There are two shortcuts that can help you to do the job.
1. Quick Linking
2. Use task templates as Copy & Paste
We have request for Split functionality on our feedback portal and it is on our radar. Please give it one more vote here: Copy/Duplicate and Split stories
TeamPulse team highly appreciates all feedback so if you have some other questions, suggestions or comments, feel free to contact us at any time.
All the best,
the Telerik team