Simplified wording of Python support policy.

docs/faq/install.txt

@@ -55,10 +55,10 @@ supported. You can find the latest micro version for each series on the `Python
 download page <https://www.python.org/downloads/>`_.
 
 Typically, we will support a Python version up to and including the first
-Django LTS release that will receive security updates until after security
-support for that version of Python ends. For example, Python 3.3 security
-support ends September 2017 and Django 1.8 LTS security support ends April
-2018. Therefore Django 1.8 is the last version to support Python 3.3.
+Django LTS release whose security support ends after security support for that
+version of Python ends. For example, Python 3.3 security support ends September
+2017 and Django 1.8 LTS security support ends April 2018. Therefore Django 1.8
+is the last version to support Python 3.3.
 
 What Python version should I use with Django?
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