I checked the script of the Revision History object and its macros and also checked the GDL Reference Guide.
In the GDL Reference Guide you will find that there is a GDL command called PARAGRAPH. Here is part of its description:
GDL scripts may include paragraph definitions prior to the first reference to that paragraph name. The paragraph defined this way can be used only in the script in which it was defined and its subsequent second generation scripts. A paragraph is defined to be a sequence of an arbitrary number of strings (max 256 characters long each) with different attributes: style, pen and material (3D). If no attributes are specified inside the paragraph definition, actual (or default) attributes are used. The new lines included in a paragraph string (using the special character '\n') will automatically split the string into identical paragraphs, each containing one line. Paragraph definitions can be referenced by name in the TEXTBLOCK command. All length type parameters (firstline_indent, left_indent, right_indent, tab_position) meaning millimeters or meters depends on the fixed_height parameter of the TEXTBLOCK definition.
The important sentence is in bold: each string within a paragraph can only be a maximum of 256 characters long.
When I checked the script I found that the macro it uses has the PARAGRAPH command in it. So the limitation applies and if a Change Description is more than 256 characters long, the Revision History object trims it as you can see in your case.
Since this is hard-coded into ARCHICAD (or more specifically, GDL) the only thing you can do is to limit your Change Descriptions to 256 characters.
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