import re
arr = ["There was an error while trying to serialize parameter http://u...content-available-to-author-only...i.org/:Message. The InnerException message with data contract name 'enumStatus:' is not expected.", "ORA-01756: quoted string not properly terminated ORA-06512: at module1, line 48 ORA-06512: at line 1"]

rx = re.compile(r'\s+(?=\bORA-\d+)|(?<=\.)\s+(?=[A-Z])')
for i in arr: print (rx.split(i))