Complex sentence: Ruth takes a job at a nursing home under the pseudonym and disguise Vesta Rose, where she befriends Mary's foul-mouthed estranged mother, and arranges for her to return to Mary's life at a very inopportune moment.
Split into simpler sentences: Ruth takes a job at a nursing home under the pseudonym and disguise Vesta Rose. There she befriends Mary's estranged mother and arranges for her mother to return to Mary's life at a very inopportune moment.