Complex sentence: Varicoceles might be noticed as soft lumps, usually above the testicle and mostly on the left side of the scrotum, that are commonly described as feeling like "a bag of worms".
Split into simpler sentences: Varicoceles might be noticed as soft lumps, usually above the testicle and mostly on the left side of the scrotum. Is is commonly described as looking feeling like "a bag of worms".