Complex sentence: Nethercutt was elected to the House in 1994 in a dramatic election in which he unseated the Speaker of the House Thomas S. Foley; it was the first time a sitting Speaker of the House was unseated since 1860.
Split into simpler sentences: Nethercutt was elected to the House in 1994 in a dramatic election in which he unseated the Speaker of the House Tom Foley. This marked the first time a sitting Speaker of the House was unseated since 1860.