Complex sentence: After her return from Australia, she began an active literary career using the pseudonym "Cycla", beginning with "A Lady's Visit to the Gold Diggings of Australia in 1852--1853" (1853).
Split into simpler sentences: After her return from Australia, she began writing under the pseudonym "Cycla". Her first book was her account of "A Lady's Visit to the Gold Diggings of Australia in 1852--1853" (1853).