Complex sentence: Its bright, prominently displayed flowers and bird attracting properties make it a desirable garden plant, and grows to only 6 to 10 m (20--35 ft) in cultivation, however has proven difficult to grow.
Split into simpler sentences: Its bright, prominently displayed flowers and bird-attracting properties make it a desirable garden plant. It reaches only about 6--10 m (20--35 ft) in cultivation, but has proven difficult to grow.