Complex sentence: In animals, somatic cells can only produce cells of the same type through continuous cell division (mitosis), but in plants the immature cells of the meristems can produce new cells which can develop into any tissue or organ, or even an entirely new plant.
Split into simpler sentences: In animals, apart from stem cells in the bone marrow, somatic cells do not have unlimited morphogenetic potential, and can only produce cells of the same type through cycles of continuous cell division (mitosis). However, the immature cells of plant meristems can produce new cells which can develop into any tissue or organ, or even an entirely new plant.