import re
s = "13371337:Bat,TH,Li-Met,Blub,9.5V,370mAHr,1/2_AA-Cell,50pcs,13351234:Radio - Antenna 2.4 GHz AB/C midi (10p),15642345:Board SMB - Some Magic Board,95653345:Board SMK 6 - Some Magic Knobs - Mod6,56735632:Control Unit Z65 - Mod9"
pattern = r"\b(?<!^)(?=[0-9]{5,9}:)"
result = re.split(pattern, s)
print(result)
aW1wb3J0IHJlCgpzID0gIjEzMzcxMzM3OkJhdCxUSCxMaS1NZXQsQmx1Yiw5LjVWLDM3MG1BSHIsMS8yX0FBLUNlbGwsNTBwY3MsMTMzNTEyMzQ6UmFkaW8gLSBBbnRlbm5hIDIuNCBHSHogQUIvQyBtaWRpICgxMHApLDE1NjQyMzQ1OkJvYXJkIFNNQiAtIFNvbWUgTWFnaWMgQm9hcmQsOTU2NTMzNDU6Qm9hcmQgU01LIDYgLSBTb21lIE1hZ2ljIEtub2JzIC0gTW9kNiw1NjczNTYzMjpDb250cm9sIFVuaXQgWjY1IC0gTW9kOSIKCnBhdHRlcm4gPSByIlxiKD88IV4pKD89WzAtOV17NSw5fTopIgpyZXN1bHQgPSByZS5zcGxpdChwYXR0ZXJuLCBzKQpwcmludChyZXN1bHQp
['13371337:Bat,TH,Li-Met,Blub,9.5V,370mAHr,1/2_AA-Cell,50pcs,', '13351234:Radio - Antenna 2.4 GHz AB/C midi (10p),', '15642345:Board SMB - Some Magic Board,', '95653345:Board SMK 6 - Some Magic Knobs - Mod6,', '56735632:Control Unit Z65 - Mod9']