Hello, teachers. Could you verify my sentences please? Any mistakes?

This exposition was opened as an alternative to the scientific exhibition "The Far Past of the Amur Region". It was created as an experiment, especially since the idea of the new exhibition and its subsequent implementation came from Andrei Viktorovich Malyavin, back then a head of the experimental department of archeology.

or

The idea and the following implementation of the exhibition belongs to Andrei Viktorovich Malyavin, back then a head of the experimental department of archeology.