Clarified wording

manual/Tasks/signjar.html

@@ -261,8 +261,8 @@ verified as of that point in time.  With trusted timestamping, users can verify
 occurred before a certificate's expiration or revocation. Without this timestamp, users can only
 verify the signature as of their current date.</p>
 
-<p>Timestamped JAR files were introduced in Java 5 and supported <em>since Ant 1.7</em>. <em>Since
-Ant 1.9.5</em>, Ant can use unauthenticated proxies for this signing process.</p>
+<p>Timestamped JAR files were introduced in Java 5; they are supported <em>since Ant
+1.7</em>. Unauthenticated proxies can be used to access TSAs <em>since Ant 1.9.5</em>.</p>
 
 <p>Common public timestamp authorities include</p>
 <ul>