Original sentence: Introduced in light of the ballistic missile threat from Pakistan, it is a two tiered system consisting of two interceptor missiles, namely Prithvi Air Defence (PAD) missile for high altitude interception, and the Advanced Air Defence (AAD) Missile for lower altitude interception
Edited sentence: Introduced in light of the ballistic missile threat from Pakistan, it is a two tiered system consisting of two interceptor missiles, namely the Prithvi Air Defence (PAD) missile for high altitude interception, and the Advanced Air Defence (AAD) Missile for lower altitude interception