In the given question, a statement divided into different segments is given. The first segment is fixed, rearrange the other segments to form a coherent statement. The dissolution of the assembly/ in the state which was (P)/ was followed by a prolonged (Q)/ already marred with political instability (R)/ tug of war for seizing the power (S)

Clearly, R and S can't follow the first segment. This eliminates option 1.

Option 2: It is incorrect since P ends with was, which can't be used to end the statement.

Option 3: It is incorrect since the statement can't end in 'by a prolonged'.

Option 4: It makes a coherent statement; hence put it on hold.

Option 5: It is incorrect because P ends in 'was' and Q begins with 'was'.

Two 'was' can't be used together. Hence, the correct sequence is PRQS.