Complex sentence: The carrying capacity of a population is the maximum number of individuals that can live in a population stably; numbers larger than this will suffer negative population growth until reaching the carrying capacity and populations smaller than the carrying capacity will grow until they reach it.
Split into simpler sentences: The carrying capacity of a population is the maximum number of individuals that can live in a population stably; numbers larger than this will suffer a negative population growth until eventually reaching the carrying capacity. Whereas populations smaller than the carrying capacity will grow until they reach it.