I have inherited a monster.
It is masquerading as a .NET 1.1 application processes text files that conform to Healthcare Claim Payment (ANSI 835) standards, but it\'
One thing I do in these cases is to use the 'Composed Method' pattern. See Jeremy Miller's Blog Post on this subject. The basic idea is to use the refactoring tools in your IDE to extract small meaningful methods. Once you've done that, you may be able to further refactor and extract meaningful classes.