Less people in Canada are planning travelling over this year because of the worse weather that happened in to many parts of the country recently and because it is expensive.
1. Word Form: Note that “people” is a count noun; as such, you must be careful with the quantifiers that modify it. “Less” is used with non-count nouns; for count nouns use “fewer”.
2. Gerund/Infinitive: After the verb “plan” use the infinitive “to travel” rather than the gerund.
3. Redundant word: “over” should be omitted because “this year” means “over the course of the year”.
4. Adjective form: “worse” is the comparative adjective for “bad”; because nothing is being compared, use “bad”.
5. Verb tense: The time frame is from some time in the past until now, so use the present perfect tense--has happened--rather than the simple past.
6. Word form: “to” is a preposition; here the adverb “too” (an intensifier) is needed.
Possible Answer: Fewer people in Canada plan to travel this year because of the bad weather that has happened in too many parts of the country and because it is expensive.