Complex sentence: When Sarah Waters was 19 years old, she joined a student house in Whitstable, Kent, sharing a bed and then falling in love with another young woman, living there for two winters in what would be a six-year relationship.
Split into simpler sentences: When Sarah Waters was 19 years old, she joined a student house in Whitstable, Kent, sharing a bed and then falling in love with another young woman. They lived there for two winters in what would be a six-year relationship.