Welcome to the Make community!
You can use the built-in function substring
together with multiple send modules.
e.g.:
{{ substring(1.text; 0; 4096) }}
{{ substring(1.text; 4096; 8192) }}
{{ substring(1.text; 8192; 12288) }}
etc.
For more information, see the function documentation in the Help Center.
Hope this helps! Let me know if there are any further questions or issues.
— @samliew