Complex sentence: It holds key artifacts from the history of science in Ireland, such as Nicholas Callan's induction coils and large electromagnet, as well as, one of only two death masks of Irish hero Daniel O'Connell.
Split into simpler sentences: It holds key artifacts from the history of science in Ireland, such as Nicholas Callan's induction coils and large electromagnet. The museum also holds one of only two death masks of Irish hero Daniel O'Connell.