Complex sentence: Topiary is the horticultural practice of training live perennial plants by clipping the foliage and twigs of trees, shrubs and subshrubs to develop and maintain clearly defined shapes, perhaps geometric or fanciful; the term also refers to plants which have been shaped in this way.
Split into simpler sentences: Topiary is the horticultural practice of training live perennial plants by clipping the foliage and twigs of trees, shrubs and subshrubs to develop and maintain clearly defined shapes, perhaps geometric or fanciful. The term also refers to plants which have been shaped in this way.