Complex sentence: In order to become a member, the national association has to submit an application which will be reviewed by the executive board and have to pay a fee of 400 EUR for a full membership or 250 EUR for an associate membership.
Split into simpler sentences: In order to become a member, the national association has to submit an application which is reviewed by the executive board. Candidates also have to pay a fee of 400 EUR for a full membership or 250 EUR for an associate membership.