Complex sentence: Immediately following the war, he married Elizabeth Evans Rhodes of Philadelphia, and in 1884 began building a baronial estate in the Catoctin Mountains called Gathland (or "Gapland"), near Burkittsville, Maryland.
Split into simpler sentences: Immediately following the war, he married Elizabeth Evans Rhodes of Philadelphia. In 1884 Townsend began building a baronial estate in the Catoctin Mountains called Gathland (or "Gapland"), near Burkittsville, Maryland.