Step 1: Initialize a stack to keep track of open parentheses and split the input text to identify and define all types of open parentheses in the text.

Step 2: Through iteration over the input characters, identify opening parentheses among the input characters and add them to the stack.

Step 3: For each open parentheses, find the corresponding closing parentheses and close the open parentheses.

Step 4: Generate the sequence of closing parentheses based on remaining open parentheses in the stack. 

Step 5: Output the completed sequence. Generate the input sequence concatenated with the generated closing sequence of parentheses, ensuring a well-formed structure.