Complex sentence: Spades is a partnership trick-taking card game devised in the United States in the 1930s, in which the object is for each pair or partnership to take at least the number of tricks they bid on before play began.
Split into simpler sentences: Spades is a trick-taking card game devised in the United States in the 1930s. The object is to take at least the number of tricks they bid on before play began.