Complex sentence: Keralolpathi mentions a Tulu invader from Alupa Dynasty, brother of Kavi Simharachan (Kavi Alupendra 1110-1160 AD) of Tulunadu assuming the title of Cheraman Perumal established a dynasty at Valarpattinam near Kannur who attacked Kerala with a large army derived from Ahichatra/Nepal.
Split into simpler sentences: Keralolpathi mentions a Tulu invader from Alupa Dynasty, brother of Kavi Simharachan (Kavi Alupendra 1110-1160 AD) of Tulunadu, who assumed the title of Cheraman Perumal and established a dynasty at Valarpattinam near Kannur. He attacked Kerala with a large army derived from Ahichatra/Nepal.