Tragically, most of these contain aluminum which several studies indicate may contribute to a development of Alzheimer's disease.
(most of these; contain; aluminum which several studies indicate may contribute to a development of Alzheimer's disease) (several studies; indicate; may contribute to a development of Alzheimer's disease)
most of these several studies
contain indicate
aluminum which several studies indicate may contribute to a development of Alzheimer's disease
may contribute to a development of Alzheimer's disease