Add punctuation: Hi my name is Princesss and I am 19 years
A: Hi, my name is Princesss and I am 19 years.

Add punctuation: Six days you shall eat unleavened bread and on the seventh day shall be a solemn assembly to Yahweh your God you shall do no work therein
A: Six days you shall eat unleavened bread; and on the seventh day shall be a solemn assembly to Yahweh your God; you shall do no work [therein].

Add punctuation: An oldfashioned Welsh grammar school headmaster one of the last of the kind his standards were very high
A:
An old-fashioned Welsh grammar school headmaster, one of the last of the kind, his standards were very high.