Complex sentence: COMS-1 was launched by Arianespace using an Ariane 5ECA carrier rocket lifting off from ELA-3 at the Guiana Space Centre in Kourou, French Guiana.
Split into simpler sentences: COMS-1 will be launched by Arianespace, using an Ariane 5ECA carrier rocket. The launch will take place from ELA-3 at the Guiana Space Centre in Kourou, French Guiana.