Complex sentence: Polygamy is defined as the practice or condition of having more than one spouse at the same time, conventionally referring to a situation where all spouses know about each other, in contrast to bigamy, where two or more spouses are usually unaware of each other.
Split into simpler sentences: Polygamy is defined as the practice or condition of having more than one spouse at the same time. Conventionally referring to a situation where all spouses know about each other.