Although not technically reforestation, agroforestry (a system of land use in which harvestable trees or shrubs are grown among or around crops or on pasture land, as a means of preserving or enhancing the productivity of the land) provides an opportunity for small-holder farmers to sustain their livelihoods while adding some forest cover to their farms.
尽管严格来说并不属于重新造林,但农林复合经营(即在农作物之间、周围,或牧场上种植可采收的树木或灌木,以保持或提高土地生产力的一种土地利用方式)为小农户提供了维持生计的机会,同时还能增加其农场的森林覆盖。
主句主语是“agroforestry”,谓语是“provides”,宾语核心是“an opportunity”。“for small-holder farmers to sustain their livelihoods”是不定式复合结构,说明机会的具体内容;句首是省略主语和系动词的让步状语从句,括号内是对“agroforestry”的同位说明。