Complex sentence: The Schenk von Stauffenberg family is a noble (see Uradel) Roman Catholic family from Swabia in Germany, whose best-known member was Colonel Claus Schenk Graf von Stauffenberg--the key figure in the 1944 "20 July plot" to assassinate Adolf Hitler.
Split into simpler sentences: The Schenk von Stauffenberg family is a noble ("Uradel ") Roman Catholic family from Swabia in Germany. The family's best-known recent member was Colonel Claus Schenk Graf von Stauffenberg--the key figure in the 1944"20 July plot" to assassinate Adolf Hitler.