Complex sentence: He adopted the pseudonym "Thaddäus Troll" in 1948, the name under which he is primarily known and chosen because he wanted his books to be on library bookshelves near to those of his role model Kurt Tucholsky.
Split into simpler sentences: He adopted the pseudonym "Thaddäus Troll" in 1948, the name under which he is primarily known. He chose the name because he wanted his books to be on library bookshelves near to those of his role model Kurt Tucholsky.