Complex sentence: From the right ventricle, blood is pumped through the pulmonary semilunar valve into the left and right pulmonary arteries (one for each lung) and travels through the lungs.
Split into simpler sentences: From the right ventricle, blood is pumped through the pulmonary semilunar valve into the pulmonary artery. This blood enters the two pulmonary arteries (one for each lung) and travels through the lungs.