Complex sentence: They speak Sambal or Bolinao, both of which are Sambalic languages; nowadays due to intermarriage or migration they also speak Tagalog or Ilocano.
Split into simpler sentences: They speak Sambal or Bolinao, both of which are Sambalic languages. Due to intermarriage or migration from other parts of the country, the Sambal nowadays also speak Tagalog or Ilocano.