the belt & braces approach ( & there's definitely a big thread on this somewhere ) is to run 2 tests.
1. for lines that begin with lower case
2. fot lines which end with " not the end of a sentence"
tricky cases are e.g.
Dr.
Roberts left the room and then I
followed him
also, beware of mangling any poetry or book extracts which are not using normal punctuation rules
see also
https://www.mobileread.com/forums/sho...d.php?t=114931