Complex sentence: Communism is a specific stage of socioeconomic development that emerges from technological advances in the productive forces that leads to a superabundance of material wealth, allowing for distribution based on need and social relations based on freely-associated individuals.
Split into simpler sentences: Communism is a specific stage of socioeconomic development predicated upon a superabundance of material wealth, which is postulated to arise from technological advances in the productive forces. This would allow for distribution based on need and social relations based on freely-associated individuals.