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Is it possible to span one expression across multiple cells? E.g. long if statement or function evaluation. I looked in documentation and searched forum/google and could not find.
No, this is not possible. A cell can only be evaluated if it contains a complete and syntactically correct expression.
You might want to try Code style cells (Alt-8 or Command-8) which contain plain text and allow arbitrary formatting with spaces, tabs and newlines.
Required, but never shown