If you really want to keep those nasty long names, what I would do is:
{% for a, b, c in items %}
{% with a as some_item %}
{% with b as some_another_item %}
{% with c as again_some_another_item_with_long_name %}
bla bla bla ..
{% endwith %}
{% endwith %}
{% endwith %}
{% endfor %}