Complex sentence: Those who still identify them as ethnic Tamils are known as Negombo Tamils or as Puttalam Tamils but most residents of these districts identify them as ethnic Sinhalese today and are some are still bilingual in both the languages.
Split into simpler sentences: Those who still identify them as ethnic Tamils are known as Negombo Tamils or as Puttalam Tamils. Although most residents of these districts identify them as ethnic Sinhalese some are bilingual in both the languages.