Complex sentence: Greatly disappointed and disenchanted by the noise and dirt in Black Hawk, she began to take walks around the city each day; then aged 23, she may have gained the name "Baby Doe" from the local men watching.
Split into simpler sentences: Greatly disappointed and disenchanted by the noise and dirt in Black Hawk, Baby Doe began to take walks around the city each day. Then aged 23, she may have gained the name "Baby Doe" from the local men watching.