The main content of the passage is to present a possible situation in which a violent leader imposes the law on the country by force ("at the point of the sword"), which presumably leads to many deaths. This was what has happened, in Paine's interpretation under William the Conqueror in England. The intention is to show that this situation is undesired in America and to encourage Americans to fight against such a government.
Can you explain it a bit better?
Pastoralism is a slightly more efficient form of subsistence. Rather than searching for food on a daily basis, members of a pastoral society rely on domesticated herd animals to meet their food needs. Pastoralists live a nomadic life, moving their herds from pasture to pasture. Because their food supply is far more reliable, pastoral societies can
And horticultural society is an organization devoted to the study and culture of cultivated plants
so the comparison is Horticultural societies grow crops as using simple tools, while on the other hand Pastoral societies raise livestock.
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