Definition: 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.
Input: In 1967, he became chairman of the SPD fraction in the Landtag, and in 1970 Minister of Science and Education in the cabinet of Minister President Heinz Kühn.

In 1967, he became chairman of the SPD fraction in the Landtag. In 1970, he became the Minister of Science and Education.