Complex sentence: Before the match, Paisley announced that striker Toshack would be fit to start; however, Toshack was not named in the squad, and this upset the Germans' game plan, thus allowing Keegan to torment his marker Berti Vogts.
Split into simpler sentences: Before the match, Paisley announced that striker Toshack would be fit to start. However Toshack was not named in the squad, and this threw the Germans game plan into disarray and allowed Keegan to torment his marker Berti Vogts.