Complex sentence: Females are 1.5 to 3.5 times more likely to progress to stress fractures from shin splints, but this is mostly due in part to females having a higher incidence of diminished bone density and osteoporosis.
Split into simpler sentences: Females are 1.5 to 3.5 times more likely to progress to stress fractures from shin splints. This is mostly due in part to females having a higher incidence of diminished bone density and osteoporosis.