Complex sentence: Tropical (sub) legumes from the genera "Glycine", "Phaseolus", "Lotus", and "Vigna" form determinate nodules that lose meristematic activity shortly after initiation, growth is due to cell expansion and mature nodules are spherical in shape.
Split into simpler sentences: Tropical (sub) legumes from the genera "Glycine", "Phaseolus", "Lotus", and "Vigna" form "determinate" nodules, that lose meristematic activity shortly after initiation. Growth is due to cell expansion, and mature nodules are spherical in shape.