Capitalization.

You could expand on this, but I'd go with a UDF.
This handles the punctation marks, "Full Stop", "Question Mark", and "Exclamation Mark" with carriage return thrown in for good luck ...

Drag C3 Across as far as you like

Formula:

=UPPER(LEFT(TRIM(MID(SUBSTITUTE(SUBSTITUTE(SUBSTITUTE(SUBSTITUTE("."&LOWER($A1),".",REPT(" ",255)),"?",REPT(" ",255)),"!",REPT(" ",255)),CHAR(10),""),COLUMNS($C:C)*255,255)),1))&MID(TRIM(MID(SUBSTITUTE(SUBSTITUTE(SUBSTITUTE(SUBSTITUTE("."&LOWER($A1),".",REPT(" ",255)),"?",REPT(" ",255)),"!",REPT(" ",255)),CHAR(10),""),COLUMNS($C:C)*255,255)),2,255)

Then in B2 expand on this, I have only allowed for 3 sentences.

Formula:

=REPLACE(REPLACE(REPLACE(A1,SEARCH(C1,A1),LEN(C1),C1),SEARCH(D1,A1),LEN(D1),D1),SEARCH(E1,A1),LEN(E1),E1)