Hello Nitin,
It is simple Split collection is used to split single collection into to collection.
this action contains 3 input parameters collection, collection template1,collection template2.
Collection input is the collection which is to be split.
collection template 1 and template contains the fields you have to split from main collection.
for example collection have 4 fields and you are splitting the collection into 2 fields each.
collection template contains 2 fields from collection and template 2 contains remaining fields.
you have to enter one row in each template collection as initial value.
Remember while creating template collection give the same data types to fields as are in main collection.
Hope you will Understand this. 🙂