Complex sentence: Claire Cunningham (born 1977) is a Scottish choreographer and dancer who has been in the limelight due to dance performances with crutches which she uses because she was born with osteoporosis, a progressive bone disease.
Split into simpler sentences: Claire Cunningham (born 1977) is a Scottish choreographer and dancer. She performs on crutches; she was born with osteoporosis, a progressive bone disease.