Complex sentence: After Holly Golightly did a cameo appearance with Thee Headcoats, Childish added her to The Delmonas lineup; soon thereafter the band was renamed Thee Headcoatees.
Split into simpler sentences: After Holly Golightly did a cameo appearance with Thee Headcoats, Childish added her to The Delmonas lineup. Soon thereafter the band was renamed Thee Headcoatees.