If it has been sent back to a "1" address... which you have the keys for... you could either import the private key into a wallet like Electrum which would allow you to create a transaction and send all the coins to wherever you want... Or you could do it all manually using:
https://coinb.in/#newTransaction (download the offline copy as per the links at the bottom of that page)
Just put in the public address at the top, click "Load"... it'll load all the unspent inputs. Adjust the options as required (I'd recommend enabling RBF in case you miscalculate the fee). You can then input the output address and amount you want to send... (NOTE that you need to calculate the fee manually. Current recommended fees are totally retarded at 450 sats/byte!!?!
)
Click submit, get the unsigned Transaction Hex...
Use the "Verify" page (
https://coinb.in/#verify) to double check everything is how you want it...
If it's all ok, then goto the "Sign" page (
https://coinb.in/#sign) paste in the hex, put in the private key... and get the signed Transaction Hex...
Then use the "Broadcast" page (
https://coinb.in/#broadcast) to actually send your transaction