Complex sentence: Adenomas can grow from many organs including the adrenal glands, pituitary gland, thyroid, prostate, etc. Although these growths are benign, over time they may progress to become malignant, at which point they are called adenocarcinomas.
Split into simpler sentences: Adenomas can grow from many glandular organs, including the adrenal glands, pituitary gland, thyroid, prostate, and others. Although adenomas are benign, over time they may progress to become malignant, at which point they are called adenocarcinomas.