recover lost partitions on external usb drive

i had an external hard drive with 2 mac os x journeled partitions on it, but while I was attempting to create a Windows 10 bootcamp on a flash thumb drive something went horribly wrong. My external hard drive appears as a single partitioned ms-dos (fat32). Is there ANY way to recover the data on the hard drive back to the two journaled partitions as I had a lot of important and personal files and folders on them.