"Its network and the patience of its customers strained to the breaking point, the on-line service company announced a series of new initiatives that try to relieve congestion."
Apparently, it is more correct to say "...new initiatives to try to relieve congestion".
Why can I use the present tense of try when I use the word "to", but can't use it if I use the word "that"? Also what else is wrong with using the word "that" here?