break a long sql vba statement into multiple lines
In VBA a space followed by underscore and nothing else after that gives you a line break.
e.g.
DoCmd.RunSQL "UPDATE INDIVIDUAL SET INDIVIDUAL.INDI_FIRSTNAME = '" & _prospect_contact!FirstName & "', INDIVIDUAL.INDI_LASTNAME = '" & _ etc
But don't break lines within a string literal: that is a syntax error.
There is a surprisingly small limit to the number of line breaks you can have.