@Vampirequeen - The 'split infinitive' occurs in English because it can... that is, it's two words ('to go', 'to eat', 'to run') with a space between them, while all the major languages that surround us have a single word form (English 'to eat', French 'manger', Spanish 'comer', Italian 'mangiare' German 'essen'). Victorian grammarians, realizing that Latin infinitives weren't splittable either, decided it was therefore wrong to slip anything between the 'to' and the verb in English, which was rather silly of them.
Often a split infinitive is poor style, although sometimes it can't be improved - 'To boldly go....' is more elegant than 'Boldly to go...' or 'To go boldly...', isn't it?