Complex sentence: Murphy was born in County Wexford, Ireland, and as an adult moved to the United States, soon after serving in the US Army starting in 1851 through 1855, re-enlisting in 1856.
Split into simpler sentences: Murphy was born in County Wexford, Ireland, and as an adult moved to the United States. He enlisted in the US Army starting in 1851 through 1855, and re-enlisted in 1856.