Complex sentence: Thermoeconomists claim that human economic systems can be modeled as thermodynamic systems then, based on this premise, attempt to develop theoretical economic analogs of the first and second laws of thermodynamics.
Split into simpler sentences: Thermoeconomists claim that human economic systems can be modeled as thermodynamic systems. Then, based on this premise, they attempt to develop theoretical economic analogs of the first and second laws of thermodynamics.