The phrase "and maybe more difficult" is correct and usable in written English.
It can be used when suggesting that something might be challenging, potentially more so than previously mentioned.
Example: "This task is already complex, and maybe more difficult than we initially anticipated."
Alternatives: "and possibly even harder" or "and perhaps more challenging".
"One of the ideas which we share with Pompidou-Metz is trying to draw crowds with very popular shows," said Alain Seban, president of the Pompidou Center in Paris, "and introduce them to maybe more difficult, more contemporary shows.
Maybe more difficult, because while both FDR and Obama had financial meltdowns to deal with, Obama also faces the meltdown meltdown -- the rapid disintegration of the planet's climate system that threatens to challenge the very foundations of our civilization.
It's maybe more difficult to win than the others because you have one chance in four years and here you have four chances in one year".
"This is a three-cornered billiard shot, maybe more difficult than that," Governor Davis said in a news briefing this evening.
Although the SAS strive to protect volunteers from extreme situations, in rural areas this maybe more difficult, with the added complication that people know each other, potentially bringing personal burdens of embarrassment, grief or responsibility.
Although the sub group were identified in the original study as superior to the larger sample originally collected [ 37], financial abuse is not an everyday issue that professionals come across; expertise maybe more difficult to develop compared with some other types of more practised decision making with higher levels of feedback [ 44].
It is difficult to explain what makes any great work great, and particularly difficult with movies, and maybe more so with "Citizen Kane" than with other great movies, because it isn't a work of special depth or a work of subtle beauty.
And maybe more attractive specs.
And maybe more than New Jersey.
