Same as you change it to any other workflow.
When the workflow was simplified, Jira Agile created a new workflow scheme for it and set that on the project. All you need to do is go to project administration and change the workflow scheme to whatever one you want to use instead of "simplified"
Sounds like your boards no longer include the status that are in the workflow you've moved the project over too. The boards won't change to match the workflow automatically (because there's no real way Jira Agile can know what you really want to end up with)
Go to the Agile Board and reconfigure the columns.
I updated the board and reconfigured the columns.
Now some Open issues cannot be moved to the In Progress column. They can only be moved to the next two columns that are for Resolved and Closed issues.
EDIT: Even though the issue (a Task) has a status of Open, in the issue page, there's no Start Progress button.
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