Complex sentence: When the school ran into difficulties and closed in 1908, Jensen remained as part of the family, acting as a foster mother for the youngest son, Lauritz Melchior, who partly thanks to her support for singing lessons later became a famous opera singer.
Split into simpler sentences: When the school ran into difficulties and closed in 1908, Jensen remained as part of the family, acting as a foster mother for the youngest son, Lauritz Melchior. Partly thanks to her support for singing lessons, he was later to became a famous opera singer.