Christ's Return

The Rapture of the church involves all believers being caught up to heaven—those just resurrected, together with those alive at the time (1 Thes:4:13-18 [13] But I would not have you to be ignorant, brethren, concerning them which are asleep, that ye sorrow not, even as others which have no hope. [14] For if we believe that Jesus died and rose again, even so them also which sleep in Jesus will God bring with him. [15] For this we say unto you by the word of the Lord, that we which are alive and remain unto the coming of the Lord shall not prevent them which are asleep. [16] For the Lord himself shall descend from heaven with a shout, with the voice of the archangel, and with the trump of God: and the dead in Christ shall rise first: [17] Then we which are alive and remain shall be caught up together with them in the clouds, to meet the Lord in the air: and so shall we ever be with the Lord. [18] Wherefore comfort one another with these words.
See All...). If it occurs at the beginning of the tribulation period, then clearly Christ’s Second Coming at the end of the Tribulation to rescue Israel in the midst of Armageddon is a separate event. According to Zechariah:14:3-5 [3] Then shall the LORD go forth, and fight against those nations, as when he fought in the day of battle. [4] And his feet shall stand in that day upon the mount of Olives, which is before Jerusalem on the east, and the mount of Olives shall cleave in the midst thereof toward the east and toward the west, and there shall be a very great valley; and half of the mountain shall remove toward the north, and half of it toward the south. [5] And ye shall flee to the valley of the mountains; for the valley of the mountains shall reach unto Azal: yea, ye shall flee, like as ye fled from before the earthquake in the days of Uzziah king of Judah: and the LORD my God shall come, and all the saints with thee.
See All..., “all the saints” must accompany Christ back to earth. But if the Rapture occurs at the end of the Tribulation, it must be simultaneous with the Second Coming, making them one event. Which is it: two events separated by seven years, or one event with two diverse purposes?