Complex sentence: In the UK the tree begins flowering in its fourth year, the perfect, apetalous wind-pollinated flowers appearing in mid March; the tree will usually begin to sucker from roots when aged about 5 years.
Split into simpler sentences: In the UK the tree begins flowering in its fourth year, the perfect, apetalous wind-pollinated flowers appearing in mid March. The tree will usually begin to sucker from roots when aged about 5 years.