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Additional social stresses may also occur because of the population explosion or problems arising from mass migration movements—themselves made relatively easy nowadays by modern means of transport.

主干识别：Additional social stresses may also occur 主谓结构

其他成分：because of the population explosion or problems arising from mass migration movements 状语

themselves made relatively easy nowadays by modern means of transport.同位语

翻译点拨：

Additional social stresses may also occur

增加的社会压力也可能会出现。

试着解释一下：additional可以译作动词增加;主语改为social stress,

社会压力也可能会增加

(may also occur 可以略去。)

because of the population explosion or problems arising from mass migration movements

因为人口爆炸和由于大规模的人口迁移而引起的种种问题

themselves made relatively easy nowadays by modern means of transport.

现代交通工具使得Themselves(大规模的人口迁移)变得相对容易。

同位语可以用括号放到解释说明的名词之后。

人口爆炸和大规模的人口迁移(现代交通工具使其变得相对容易)引起的种种问题

参考译文：由于人口猛增或大量人口流动(现代交通工具使大量人口流动变得相对容易)所引起了各种问题这也增加了新的社会压力。