Complex sentence: According to the police, the terrorists were divided in two groups; the first reached the spot on a motorcycle and the second group followed them in a Maruti car, which later caught fire due to the "crudely-assembled" pressure cooker bomb in it.
Split into simpler sentences: According to the police, the terrorists were divided in two groups, while the first reached the spot on a motorcycle and second group followed them in a Maruti car, which was later set afire. The car caught fire due to a "crudely-assembled" pressure cooker bomb in it.