Complex sentence: When sheep farming became more profitable than any alternative, land was cleared by compulsory emigration--in 1853 the whole of the village of Gruilin, fourteen families, was forced to leave.
Split into simpler sentences: When sheep farming became more profitable than any alternative, land was cleared by compulsory emigration. Later, in 1853, the whole of the village of Gruilin, fourteen families, was forced to leave.