Complex sentence: Batak ponies from the Sultanate of Deli in Sumatra were introduced into the Malaya in the Dutch era, and were often called "palonguins" or later "gharries".
Split into simpler sentences: Batak ponies from the Sultanate of Deli in Sumatra were introduced into Malaya in the Dutch era. They were often called "palonguins" or, later, "gharries".