Complex sentence: Otherwise, the use of Spanish and Portuguese quickly diminished amongst the Spanish and Portuguese Jews after the 17th century, and from the mid- 19th century on, Spanish and Portuguese were in practice replaced with local languages in everyday use.
Split into simpler sentences: Otherwise, the use of Spanish and Portuguese quickly diminished amongst the Spanish and Portuguese Jews after the 17th century. From the mid- 19th century on, Spanish and Portuguese were in practice replaced with local languages in everyday use.