Rewrite each original sentence in order to make it easier to understand by non-native speakers of English. You can do so by replacing complex words with simpler synonyms (i.e. paraphrasing), deleting unimportant information (i.e. compression), and/or splitting a long complex sentence into several simpler ones. The final simplified sentences need to be grammatical, fluent, and retain the main ideas of their original counterparts without altering their meanings.
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Question: In 1252 documents refer directly to Vaihingen as a town, established by Count Gottfried von Vaihingen.

Answer: Papers from 1252 say that Vaihingen is a town, created by Count Gottfried von Vaihingen.

Question: He led a furious comeback as he completed 15 passes out of 20 attempted for 258 yds and 2 TDs.

Answer: His strong comeback consisted of finishing 15 passes with 2 touchdowns.

Question: In 1265, Simon de Montfort, 6th Earl of Leicester summoned the first elected Parliament.

Answer:
Simon de Montfort was the 6th Earl of Leicester. In 1265, he called the first elected Parliament.