Complex sentence: Using his amateur radio equipment, he calls up other radio amateurs, based in Hawaii, Wichita Falls and Portland, Maine, who contact the police, after some problems as to which side (callers or emergency services) should take the phone bill.
Split into simpler sentences: Using his amateur radio equipment, he calls up other radio amateurs, based in Hawaii, Portland, Maine and Wichita Falls, who contact the police. The alarm is thus raised, after some problems as to which side (callers or emergency services) should take the phone bill.