Style improvements

line 542: the establishing reference (prep.) was missing, I've added it.
line 547: there's a either the singular or definite article missing in front of the noun, respectively the plural-suffix should be attached to "style creation". Either or, depending on your context, so I didn't want to fill just anything into, suit yourself. 
line 561: I think you meant "weakened", I erased the /n/.
line 586:I've inserted  a different preposition and the definite article due to stylistic reasons.
line 609: I've inserted a missing comma and corrected the tense (if-clause).
line 611: You meant "start with", "to begin with" has a different semantic meaning (see the Bible or texts dating from the 19th c.)