Complex sentence: Nambigal was overwhelmed with kindness showed by Ramanuja and he bestowed the name "Emperumanar" on Ramanuja, which is used to this day by those of the Srivaishnava sect.
Split into simpler sentences: Nambigal was overwhelmed by this kindness showed by Ramanuja and he bestowed the name "Emperumanar" on Ramanuja. This title is used to this day by those of the Srivaishnava sect.